GCC Code Coverage Report


Directory: ./
File: src/nep/impls/ciss/nciss.c
Date: 2025-11-19 04:19:03
Exec Total Coverage
Lines: 614 653 94.0%
Functions: 30 30 100.0%
Branches: 1856 3514 52.8%

Line Branch Exec Source
1 /*
2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3 SLEPc - Scalable Library for Eigenvalue Problem Computations
4 Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain
5
6 This file is part of SLEPc.
7 SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9 */
10 /*
11 SLEPc eigensolver: "ciss"
12
13 Method: Contour Integral Spectral Slicing
14
15 Algorithm:
16
17 Contour integral based on Sakurai-Sugiura method to construct a
18 subspace, with various eigenpair extractions (Rayleigh-Ritz,
19 explicit moment).
20
21 Based on code contributed by Y. Maeda, T. Sakurai.
22
23 References:
24
25 [1] J. Asakura, T. Sakurai, H. Tadano, T. Ikegami, K. Kimura, "A
26 numerical method for nonlinear eigenvalue problems using contour
27 integrals", JSIAM Lett. 1:52-55, 2009.
28
29 [2] S. Yokota and T. Sakurai, "A projection method for nonlinear
30 eigenvalue problems using contour integrals", JSIAM Lett.
31 5:41-44, 2013.
32 */
33
34 #include <slepc/private/nepimpl.h> /*I "slepcnep.h" I*/
35 #include <slepc/private/slepccontour.h>
36
37 typedef struct _n_nep_ciss_project *NEP_CISS_PROJECT;
38 typedef struct {
39 /* parameters */
40 PetscInt N; /* number of integration points (32) */
41 PetscInt L; /* block size (16) */
42 PetscInt M; /* moment degree (N/4 = 4) */
43 PetscReal delta; /* threshold of singular value (1e-12) */
44 PetscInt L_max; /* maximum number of columns of the source matrix V */
45 PetscReal spurious_threshold; /* discard spurious eigenpairs */
46 PetscBool isreal; /* T(z) is real for real z */
47 PetscInt npart; /* number of partitions */
48 PetscInt refine_inner;
49 PetscInt refine_blocksize;
50 NEPCISSExtraction extraction;
51 /* private data */
52 SlepcContourData contour;
53 PetscReal *sigma; /* threshold for numerical rank */
54 PetscScalar *weight;
55 PetscScalar *omega;
56 PetscScalar *pp;
57 BV V;
58 BV S;
59 BV Y;
60 PetscBool useconj;
61 Mat J; /* auxiliary matrix when using subcomm */
62 BV pV;
63 NEP_CISS_PROJECT dsctxf;
64 PetscObjectId rgid;
65 PetscObjectState rgstate;
66 } NEP_CISS;
67
68 struct _n_nep_ciss_project {
69 NEP nep;
70 BV Q;
71 };
72
73 2040 static PetscErrorCode NEPContourDSComputeMatrix(DS ds,PetscScalar lambda,PetscBool deriv,DSMatType mat,void *ctx)
74 {
75 2040 NEP_CISS_PROJECT proj = (NEP_CISS_PROJECT)ctx;
76 2040 Mat M,fun;
77
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2040 PetscFunctionBegin;
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2040 if (!deriv) {
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2040 PetscCall(NEPComputeFunction(proj->nep,lambda,proj->nep->function,proj->nep->function));
81 2040 fun = proj->nep->function;
82 } else {
83 PetscCall(NEPComputeJacobian(proj->nep,lambda,proj->nep->jacobian));
84 fun = proj->nep->jacobian;
85 }
86
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2040 PetscCall(DSGetMat(ds,mat,&M));
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2040 PetscCall(BVMatProject(proj->Q,fun,proj->Q,M));
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2040 PetscCall(DSRestoreMat(ds,mat,&M));
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408 PetscFunctionReturn(PETSC_SUCCESS);
90 }
91
92 1120 static PetscErrorCode NEPComputeFunctionSubcomm(NEP nep,PetscScalar lambda,Mat T,Mat P,PetscBool deriv)
93 {
94 1120 PetscInt i;
95 1120 PetscScalar alpha;
96 1120 NEP_CISS *ctx = (NEP_CISS*)nep->data;
97
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1120 PetscFunctionBegin;
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1120 PetscAssert(nep->fui!=NEP_USER_INTERFACE_CALLBACK,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_WRONGSTATE,"Should not arrive here with callbacks");
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1120 PetscCall(MatZeroEntries(T));
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1120 if (!deriv && T != P) PetscCall(MatZeroEntries(P));
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4160 for (i=0;i<nep->nt;i++) {
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3040 if (!deriv) PetscCall(FNEvaluateFunction(nep->f[i],lambda,&alpha));
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1520 else PetscCall(FNEvaluateDerivative(nep->f[i],lambda,&alpha));
105
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3040 PetscCall(MatAXPY(T,alpha,ctx->contour->pA[i],nep->mstr));
106
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3040 if (!deriv && T != P) PetscCall(MatAXPY(P,alpha,ctx->contour->pP[i],nep->mstrp));
107 }
108
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224 PetscFunctionReturn(PETSC_SUCCESS);
109 }
110
111 /*
112 Set up KSP solvers for every integration point
113 */
114 197 static PetscErrorCode NEPCISSSetUp(NEP nep,Mat T,Mat P)
115 {
116 197 NEP_CISS *ctx = (NEP_CISS*)nep->data;
117 197 SlepcContourData contour;
118 197 PetscInt i,p_id;
119 197 Mat Amat,Pmat;
120
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197 PetscFunctionBegin;
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197 if (!ctx->contour || !ctx->contour->ksp) PetscCall(NEPCISSGetKSPs(nep,NULL,NULL));
123 197 contour = ctx->contour;
124
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197 PetscAssert(ctx->contour && ctx->contour->ksp,PetscObjectComm((PetscObject)nep),PETSC_ERR_PLIB,"Something went wrong with NEPCISSGetKSPs()");
125
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4101 for (i=0;i<contour->npoints;i++) {
126 3904 p_id = i*contour->subcomm->n + contour->subcomm->color;
127
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3904 PetscCall(MatDuplicate(T,MAT_DO_NOT_COPY_VALUES,&Amat));
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3904 if (T != P) PetscCall(MatDuplicate(P,MAT_DO_NOT_COPY_VALUES,&Pmat)); else Pmat = Amat;
129
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3904 if (contour->subcomm->n == 1 || nep->fui==NEP_USER_INTERFACE_CALLBACK) PetscCall(NEPComputeFunction(nep,ctx->omega[p_id],Amat,Pmat));
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560 else PetscCall(NEPComputeFunctionSubcomm(nep,ctx->omega[p_id],Amat,Pmat,PETSC_FALSE));
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3904 PetscCall(NEP_KSPSetOperators(contour->ksp[i],Amat,Pmat));
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3904 PetscCall(MatDestroy(&Amat));
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3904 if (T != P) PetscCall(MatDestroy(&Pmat));
134 }
135
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40 PetscFunctionReturn(PETSC_SUCCESS);
136 }
137
138 /*
139 Y_i = F(z_i)^{-1}Fp(z_i)V for every integration point, Y=[Y_i] is in the context
140 */
141 203 static PetscErrorCode NEPCISSSolve(NEP nep,Mat dT,BV V,PetscInt L_start,PetscInt L_end)
142 {
143 203 NEP_CISS *ctx = (NEP_CISS*)nep->data;
144 203 SlepcContourData contour = ctx->contour;
145 203 PetscInt i,p_id;
146 203 Mat MV,BMV=NULL,MC;
147
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203 PetscFunctionBegin;
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203 PetscCall(BVSetActiveColumns(V,L_start,L_end));
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203 PetscCall(BVGetMat(V,&MV));
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4299 for (i=0;i<contour->npoints;i++) {
152 4096 p_id = i*contour->subcomm->n + contour->subcomm->color;
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4096 if (contour->subcomm->n==1 || nep->fui==NEP_USER_INTERFACE_CALLBACK) PetscCall(NEPComputeJacobian(nep,ctx->omega[p_id],dT));
154
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560 else PetscCall(NEPComputeFunctionSubcomm(nep,ctx->omega[p_id],dT,NULL,PETSC_TRUE));
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4096 PetscCall(BVSetActiveColumns(ctx->Y,i*ctx->L+L_start,i*ctx->L+L_end));
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4096 PetscCall(BVGetMat(ctx->Y,&MC));
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4096 if (!i) {
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203 PetscCall(MatProductCreate(dT,MV,NULL,&BMV));
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203 PetscCall(MatProductSetType(BMV,MATPRODUCT_AB));
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203 PetscCall(MatProductSetFromOptions(BMV));
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203 PetscCall(MatProductSymbolic(BMV));
162 }
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4096 PetscCall(MatProductNumeric(BMV));
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4096 PetscCall(KSPMatSolve(contour->ksp[i],BMV,MC));
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4096 PetscCall(BVRestoreMat(ctx->Y,&MC));
166 }
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203 PetscCall(MatDestroy(&BMV));
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203 PetscCall(BVRestoreMat(V,&MV));
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41 PetscFunctionReturn(PETSC_SUCCESS);
170 }
171
172 197 static PetscErrorCode NEPSetUp_CISS(NEP nep)
173 {
174 197 NEP_CISS *ctx = (NEP_CISS*)nep->data;
175 197 SlepcContourData contour;
176 197 PetscInt nwork;
177 197 PetscBool istrivial,isellipse,flg;
178 197 NEP_CISS_PROJECT dsctxf;
179 197 PetscObjectId id;
180 197 PetscObjectState state;
181 197 Vec v0;
182
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197 PetscFunctionBegin;
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197 if (nep->ncv==PETSC_DETERMINE) nep->ncv = ctx->L_max*ctx->M;
185 else {
186 90 ctx->L_max = nep->ncv/ctx->M;
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90 if (!ctx->L_max) {
188 ctx->L_max = 1;
189 nep->ncv = ctx->L_max*ctx->M;
190 }
191 }
192 197 ctx->L = PetscMin(ctx->L,ctx->L_max);
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197 if (nep->max_it==PETSC_DETERMINE) nep->max_it = 5;
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197 if (nep->mpd==PETSC_DETERMINE) nep->mpd = nep->ncv;
195
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197 if (!nep->which) nep->which = NEP_ALL;
196
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197 PetscCheck(nep->which==NEP_ALL,PetscObjectComm((PetscObject)nep),PETSC_ERR_SUP,"This solver supports only computing all eigenvalues");
197
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197 NEPCheckUnsupported(nep,NEP_FEATURE_STOPPING | NEP_FEATURE_TWOSIDED);
198
199 /* check region */
200
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197 PetscCall(RGIsTrivial(nep->rg,&istrivial));
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197 PetscCheck(!istrivial,PetscObjectComm((PetscObject)nep),PETSC_ERR_SUP,"CISS requires a nontrivial region, e.g. -rg_type ellipse ...");
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197 PetscCall(RGGetComplement(nep->rg,&flg));
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197 PetscCheck(!flg,PetscObjectComm((PetscObject)nep),PETSC_ERR_SUP,"A region with complement flag set is not allowed");
204
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197 PetscCall(PetscObjectTypeCompare((PetscObject)nep->rg,RGELLIPSE,&isellipse));
205
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197 PetscCheck(isellipse,PetscObjectComm((PetscObject)nep),PETSC_ERR_SUP,"Currently only implemented for elliptic regions");
206
207 /* if the region has changed, then reset contour data */
208
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197 PetscCall(PetscObjectGetId((PetscObject)nep->rg,&id));
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197 PetscCall(PetscObjectStateGet((PetscObject)nep->rg,&state));
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197 if (ctx->rgid && (id != ctx->rgid || state != ctx->rgstate)) {
211 PetscCall(SlepcContourDataDestroy(&ctx->contour));
212 PetscCall(PetscInfo(nep,"Resetting the contour data structure due to a change of region\n"));
213 ctx->rgid = id; ctx->rgstate = state;
214 }
215
216 /* create contour data structure */
217
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197 if (!ctx->contour) {
218 PetscCall(RGCanUseConjugates(nep->rg,ctx->isreal,&ctx->useconj));
219 PetscCall(SlepcContourDataCreate(ctx->useconj?ctx->N/2:ctx->N,ctx->npart,(PetscObject)nep,&ctx->contour));
220 }
221
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197 PetscCall(NEPAllocateSolution(nep,0));
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197 if (ctx->weight) PetscCall(PetscFree4(ctx->weight,ctx->omega,ctx->pp,ctx->sigma));
224
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197 PetscCall(PetscMalloc4(ctx->N,&ctx->weight,ctx->N,&ctx->omega,ctx->N,&ctx->pp,ctx->L_max*ctx->M,&ctx->sigma));
225
226 /* allocate basis vectors */
227
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197 PetscCall(BVDestroy(&ctx->S));
228
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197 PetscCall(BVDuplicateResize(nep->V,ctx->L*ctx->M,&ctx->S));
229
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197 PetscCall(BVDestroy(&ctx->V));
230
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197 PetscCall(BVDuplicateResize(nep->V,ctx->L,&ctx->V));
231
232 197 contour = ctx->contour;
233
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197 if (contour->subcomm && contour->subcomm->n != 1 && nep->fui==NEP_USER_INTERFACE_CALLBACK) {
234
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30 PetscCall(NEPComputeFunction(nep,0,nep->function,nep->function_pre));
235
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30 PetscCall(SlepcContourRedundantMat(contour,1,&nep->function,(nep->function!=nep->function_pre)?&nep->function_pre:NULL));
236
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167 } else PetscCall(SlepcContourRedundantMat(contour,nep->nt,nep->A,nep->P));
237
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197 if (contour->pA) {
238
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90 if (!ctx->J) PetscCall(MatDuplicate(contour->pA[0],MAT_DO_NOT_COPY_VALUES,&ctx->J));
239
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90 PetscCall(BVGetColumn(ctx->V,0,&v0));
240
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90 PetscCall(SlepcContourScatterCreate(contour,v0));
241
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90 PetscCall(BVRestoreColumn(ctx->V,0,&v0));
242
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90 PetscCall(BVDestroy(&ctx->pV));
243
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90 PetscCall(BVCreate(PetscObjectComm((PetscObject)contour->xsub),&ctx->pV));
244
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90 PetscCall(BVSetSizesFromVec(ctx->pV,contour->xsub,nep->n));
245
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90 PetscCall(BVSetFromOptions(ctx->pV));
246
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90 PetscCall(BVResize(ctx->pV,ctx->L,PETSC_FALSE));
247 }
248
249
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197 PetscCall(BVDestroy(&ctx->Y));
250
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197 if (contour->pA) {
251
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90 PetscCall(BVCreate(PetscObjectComm((PetscObject)contour->xsub),&ctx->Y));
252
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90 PetscCall(BVSetSizesFromVec(ctx->Y,contour->xsub,nep->n));
253
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90 PetscCall(BVSetFromOptions(ctx->Y));
254
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90 PetscCall(BVResize(ctx->Y,contour->npoints*ctx->L,PETSC_FALSE));
255
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107 } else PetscCall(BVDuplicateResize(nep->V,contour->npoints*ctx->L,&ctx->Y));
256
257
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197 if (ctx->extraction == NEP_CISS_EXTRACTION_RITZ) {
258
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117 PetscCall(DSSetMethod(nep->ds,1));
259
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117 PetscCall(DSNEPSetRG(nep->ds,nep->rg));
260
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117 if (nep->fui==NEP_USER_INTERFACE_SPLIT) PetscCall(DSNEPSetFN(nep->ds,nep->nt,nep->f));
261 else {
262
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30 PetscCall(PetscNew(&dsctxf));
263
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30 PetscCall(DSNEPSetComputeMatrixFunction(nep->ds,NEPContourDSComputeMatrix,dsctxf));
264 30 dsctxf->nep = nep;
265 30 ctx->dsctxf = dsctxf;
266 }
267 }
268
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197 PetscCall(DSAllocate(nep->ds,nep->ncv));
269
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197 nwork = (nep->fui==NEP_USER_INTERFACE_SPLIT)? 2: 1;
270
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197 PetscCall(NEPSetWorkVecs(nep,nwork));
271
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40 PetscFunctionReturn(PETSC_SUCCESS);
272 }
273
274 197 static PetscErrorCode NEPSolve_CISS(NEP nep)
275 {
276 197 NEP_CISS *ctx = (NEP_CISS*)nep->data;
277 197 SlepcContourData contour = ctx->contour;
278 197 Mat X,M,E,T,P,J;
279 197 BV V;
280 197 PetscInt i,j,ld,L_add=0,nv=0,L_base=ctx->L,inner,*inside;
281 197 PetscScalar *Mu,*H0,*H1,*rr,*temp,center;
282 197 PetscReal error,max_error,radius,rgscale,est_eig,eta;
283 197 PetscBool isellipse,*fl1;
284 197 Vec si;
285 197 SlepcSC sc;
286 197 PetscRandom rand;
287
288
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197 PetscFunctionBegin;
289
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197 PetscCall(DSGetSlepcSC(nep->ds,&sc));
290 197 sc->comparison = SlepcCompareLargestMagnitude;
291 197 sc->comparisonctx = NULL;
292 197 sc->map = NULL;
293 197 sc->mapobj = NULL;
294
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197 PetscCall(DSGetLeadingDimension(nep->ds,&ld));
295
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197 PetscCall(RGComputeQuadrature(nep->rg,RG_QUADRULE_TRAPEZOIDAL,ctx->N,ctx->omega,ctx->pp,ctx->weight));
296
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197 if (contour->pA) {
297 90 T = contour->pA[0];
298
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90 P = ((nep->fui==NEP_USER_INTERFACE_SPLIT && nep->P) || (nep->fui==NEP_USER_INTERFACE_CALLBACK && contour->pP))? contour->pP[0]: T;
299 } else {
300 107 T = nep->function;
301
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107 P = nep->function_pre? nep->function_pre: nep->function;
302 }
303
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197 PetscCall(NEPCISSSetUp(nep,T,P));
304
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197 PetscCall(BVSetActiveColumns(ctx->V,0,ctx->L));
305
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197 PetscCall(BVSetRandomSign(ctx->V));
306
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197 PetscCall(BVGetRandomContext(ctx->V,&rand));
307
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197 if (contour->pA) {
308 90 J = ctx->J;
309 90 V = ctx->pV;
310
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90 PetscCall(BVScatter(ctx->V,ctx->pV,contour->scatterin,contour->xdup));
311 } else {
312 107 J = nep->jacobian;
313 107 V = ctx->V;
314 }
315
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197 PetscCall(NEPCISSSolve(nep,J,V,0,ctx->L));
316
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197 PetscCall(PetscObjectTypeCompare((PetscObject)nep->rg,RGELLIPSE,&isellipse));
317
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197 if (isellipse) {
318
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197 PetscCall(BVTraceQuadrature(ctx->Y,ctx->V,ctx->L,ctx->L,ctx->weight,contour->scatterin,contour->subcomm,contour->npoints,ctx->useconj,&est_eig));
319
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197 PetscCall(PetscInfo(nep,"Estimated eigenvalue count: %f\n",(double)est_eig));
320 197 eta = PetscPowReal(10.0,-PetscLog10Real(nep->tol)/ctx->N);
321 197 L_add = PetscMax(0,(PetscInt)PetscCeilReal((est_eig*eta)/ctx->M)-ctx->L);
322
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197 if (L_add>ctx->L_max-ctx->L) {
323 PetscCall(PetscInfo(nep,"Number of eigenvalues inside the contour path may be too large\n"));
324 L_add = ctx->L_max-ctx->L;
325 }
326 }
327 /* Updates L after estimate the number of eigenvalue */
328
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197 if (L_add>0) {
329
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5 PetscCall(PetscInfo(nep,"Changing L %" PetscInt_FMT " -> %" PetscInt_FMT " by Estimate #Eig\n",ctx->L,ctx->L+L_add));
330
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5 PetscCall(BVCISSResizeBases(ctx->S,contour->pA?ctx->pV:ctx->V,ctx->Y,ctx->L,ctx->L+L_add,ctx->M,contour->npoints));
331
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5 PetscCall(BVSetActiveColumns(ctx->V,ctx->L,ctx->L+L_add));
332
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5 PetscCall(BVSetRandomSign(ctx->V));
333
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5 if (contour->pA) PetscCall(BVScatter(ctx->V,ctx->pV,contour->scatterin,contour->xdup));
334 5 ctx->L += L_add;
335
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5 PetscCall(NEPCISSSolve(nep,J,V,ctx->L-L_add,ctx->L));
336 }
337
338
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197 PetscCall(PetscMalloc2(ctx->L*ctx->L*ctx->M*2,&Mu,ctx->L*ctx->M*ctx->L*ctx->M,&H0));
339
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197 for (i=0;i<ctx->refine_blocksize;i++) {
340
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15 PetscCall(BVDotQuadrature(ctx->Y,V,Mu,ctx->M,ctx->L,ctx->L,ctx->weight,ctx->pp,contour->subcomm,contour->npoints,ctx->useconj));
341
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15 PetscCall(CISS_BlockHankel(Mu,0,ctx->L,ctx->M,H0));
342
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15 PetscCall(PetscLogEventBegin(NEP_CISS_SVD,nep,0,0,0));
343
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15 PetscCall(SlepcCISS_BH_SVD(H0,ctx->L*ctx->M,ctx->delta,ctx->sigma,&nv));
344
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15 PetscCall(PetscLogEventEnd(NEP_CISS_SVD,nep,0,0,0));
345
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15 if (ctx->sigma[0]<=ctx->delta || nv < ctx->L*ctx->M || ctx->L == ctx->L_max) break;
346 L_add = L_base;
347 if (ctx->L+L_add>ctx->L_max) L_add = ctx->L_max-ctx->L;
348 PetscCall(PetscInfo(nep,"Changing L %" PetscInt_FMT " -> %" PetscInt_FMT " by SVD(H0)\n",ctx->L,ctx->L+L_add));
349 PetscCall(BVCISSResizeBases(ctx->S,contour->pA?ctx->pV:ctx->V,ctx->Y,ctx->L,ctx->L+L_add,ctx->M,contour->npoints));
350 PetscCall(BVSetActiveColumns(ctx->V,ctx->L,ctx->L+L_add));
351 PetscCall(BVSetRandomSign(ctx->V));
352 if (contour->pA) PetscCall(BVScatter(ctx->V,ctx->pV,contour->scatterin,contour->xdup));
353 ctx->L += L_add;
354 PetscCall(NEPCISSSolve(nep,J,V,ctx->L-L_add,ctx->L));
355 if (L_add) {
356 PetscCall(PetscFree2(Mu,H0));
357 PetscCall(PetscMalloc2(ctx->L*ctx->L*ctx->M*2,&Mu,ctx->L*ctx->M*ctx->L*ctx->M,&H0));
358 }
359 }
360
361
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197 PetscCall(RGGetScale(nep->rg,&rgscale));
362
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197 PetscCall(RGEllipseGetParameters(nep->rg,&center,&radius,NULL));
363
364
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197 if (ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) PetscCall(PetscMalloc1(ctx->L*ctx->M*ctx->L*ctx->M,&H1));
365
366 395 while (nep->reason == NEP_CONVERGED_ITERATING) {
367 198 nep->its++;
368
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198 for (inner=0;inner<=ctx->refine_inner;inner++) {
369
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198 if (ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) {
370
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40 PetscCall(BVDotQuadrature(ctx->Y,V,Mu,ctx->M,ctx->L,ctx->L,ctx->weight,ctx->pp,contour->subcomm,contour->npoints,ctx->useconj));
371
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40 PetscCall(CISS_BlockHankel(Mu,0,ctx->L,ctx->M,H0));
372
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40 PetscCall(PetscLogEventBegin(NEP_CISS_SVD,nep,0,0,0));
373
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40 PetscCall(SlepcCISS_BH_SVD(H0,ctx->L*ctx->M,ctx->delta,ctx->sigma,&nv));
374
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40 PetscCall(PetscLogEventEnd(NEP_CISS_SVD,nep,0,0,0));
375 } else {
376
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158 PetscCall(BVSumQuadrature(ctx->S,ctx->Y,ctx->M,ctx->L,ctx->L,ctx->weight,ctx->pp,contour->scatterin,contour->subcomm,contour->npoints,ctx->useconj));
377 /* compute SVD of S */
378
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276 PetscCall(BVSVDAndRank(ctx->S,ctx->M,ctx->L,ctx->delta,(ctx->extraction==NEP_CISS_EXTRACTION_CAA)?BV_SVD_METHOD_QR_CAA:BV_SVD_METHOD_QR,H0,ctx->sigma,&nv));
379 }
380
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198 PetscCall(PetscInfo(nep,"Estimated rank: nv = %" PetscInt_FMT "\n",nv));
381
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198 if (ctx->sigma[0]>ctx->delta && nv==ctx->L*ctx->M && inner!=ctx->refine_inner) {
382 PetscCall(BVSumQuadrature(ctx->S,ctx->Y,ctx->M,ctx->L,ctx->L,ctx->weight,ctx->pp,contour->scatterin,contour->subcomm,contour->npoints,ctx->useconj));
383 PetscCall(BVSetActiveColumns(ctx->S,0,ctx->L));
384 PetscCall(BVSetActiveColumns(ctx->V,0,ctx->L));
385 PetscCall(BVCopy(ctx->S,ctx->V));
386 if (contour->pA) PetscCall(BVScatter(ctx->V,ctx->pV,contour->scatterin,contour->xdup));
387 PetscCall(NEPCISSSolve(nep,J,V,0,ctx->L));
388 } else break;
389 }
390 198 nep->nconv = 0;
391
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198 if (nv == 0) { nep->reason = NEP_CONVERGED_TOL; break; }
392 else {
393 /* Extracting eigenpairs */
394
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198 PetscCall(DSSetDimensions(nep->ds,nv,0,0));
395
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198 PetscCall(DSSetState(nep->ds,DS_STATE_RAW));
396
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198 if (ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) {
397
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40 PetscCall(CISS_BlockHankel(Mu,0,ctx->L,ctx->M,H0));
398
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40 PetscCall(CISS_BlockHankel(Mu,1,ctx->L,ctx->M,H1));
399
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40 PetscCall(DSGetArray(nep->ds,DS_MAT_A,&temp));
400
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255 for (j=0;j<nv;j++)
401
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1450 for (i=0;i<nv;i++)
402 1235 temp[i+j*ld] = H1[i+j*ctx->L*ctx->M];
403
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40 PetscCall(DSRestoreArray(nep->ds,DS_MAT_A,&temp));
404
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40 PetscCall(DSGetArray(nep->ds,DS_MAT_B,&temp));
405
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255 for (j=0;j<nv;j++)
406
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1450 for (i=0;i<nv;i++)
407 1235 temp[i+j*ld] = H0[i+j*ctx->L*ctx->M];
408
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40 PetscCall(DSRestoreArray(nep->ds,DS_MAT_B,&temp));
409
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158 } else if (ctx->extraction == NEP_CISS_EXTRACTION_CAA) {
410
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40 PetscCall(BVSetActiveColumns(ctx->S,0,nv));
411
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40 PetscCall(DSGetArray(nep->ds,DS_MAT_A,&temp));
412
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250 for (i=0;i<nv;i++) PetscCall(PetscArraycpy(temp+i*ld,H0+i*nv,nv));
413
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40 PetscCall(DSRestoreArray(nep->ds,DS_MAT_A,&temp));
414 } else {
415
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118 PetscCall(BVSetActiveColumns(ctx->S,0,nv));
416
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118 if (nep->fui==NEP_USER_INTERFACE_SPLIT) {
417
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328 for (i=0;i<nep->nt;i++) {
418
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240 PetscCall(DSGetMat(nep->ds,DSMatExtra[i],&E));
419
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240 PetscCall(BVMatProject(ctx->S,nep->A[i],ctx->S,E));
420
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240 PetscCall(DSRestoreMat(nep->ds,DSMatExtra[i],&E));
421 }
422 30 } else { ctx->dsctxf->Q = ctx->S; }
423 }
424
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198 PetscCall(DSSolve(nep->ds,nep->eigr,nep->eigi));
425
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198 PetscCall(DSSynchronize(nep->ds,nep->eigr,nep->eigi));
426
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198 PetscCall(DSGetDimensions(nep->ds,NULL,NULL,NULL,&nv));
427
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198 if (ctx->extraction == NEP_CISS_EXTRACTION_CAA || ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) {
428
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505 for (i=0;i<nv;i++) {
429 425 nep->eigr[i] = (nep->eigr[i]*radius+center)*rgscale;
430 }
431 }
432
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198 PetscCall(PetscMalloc3(nv,&fl1,nv,&inside,nv,&rr));
433
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198 PetscCall(DSVectors(nep->ds,DS_MAT_X,NULL,NULL));
434
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198 PetscCall(DSGetMat(nep->ds,DS_MAT_X,&X));
435
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198 PetscCall(SlepcCISS_isGhost(X,nv,ctx->sigma,ctx->spurious_threshold,fl1));
436
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198 PetscCall(DSRestoreMat(nep->ds,DS_MAT_X,&X));
437
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198 PetscCall(RGCheckInside(nep->rg,nv,nep->eigr,nep->eigi,inside));
438
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1140 for (i=0;i<nv;i++) {
439
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942 if (fl1[i] && inside[i]>=0) {
440 837 rr[i] = 1.0;
441 837 nep->nconv++;
442 105 } else rr[i] = 0.0;
443 }
444
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198 PetscCall(DSSort(nep->ds,nep->eigr,nep->eigi,rr,NULL,&nep->nconv));
445
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198 PetscCall(DSSynchronize(nep->ds,nep->eigr,nep->eigi));
446
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198 if (ctx->extraction == NEP_CISS_EXTRACTION_CAA || ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) {
447
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505 for (i=0;i<nv;i++) nep->eigr[i] = (nep->eigr[i]*radius+center)*rgscale;
448 }
449
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198 PetscCall(PetscFree3(fl1,inside,rr));
450
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198 PetscCall(BVSetActiveColumns(nep->V,0,nv));
451
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198 PetscCall(DSVectors(nep->ds,DS_MAT_X,NULL,NULL));
452
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198 if (ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) {
453
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40 PetscCall(BVSumQuadrature(ctx->S,ctx->Y,ctx->M,ctx->L,ctx->L,ctx->weight,ctx->pp,contour->scatterin,contour->subcomm,contour->npoints,ctx->useconj));
454
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40 PetscCall(BVSetActiveColumns(ctx->S,0,nv));
455
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40 PetscCall(BVCopy(ctx->S,nep->V));
456
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40 PetscCall(DSGetMat(nep->ds,DS_MAT_X,&X));
457
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40 PetscCall(BVMultInPlace(ctx->S,X,0,nep->nconv));
458
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40 PetscCall(BVMultInPlace(nep->V,X,0,nep->nconv));
459
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40 PetscCall(DSRestoreMat(nep->ds,DS_MAT_X,&X));
460 } else {
461
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158 PetscCall(DSGetMat(nep->ds,DS_MAT_X,&X));
462
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158 PetscCall(BVMultInPlace(ctx->S,X,0,nep->nconv));
463
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158 PetscCall(DSRestoreMat(nep->ds,DS_MAT_X,&X));
464
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158 PetscCall(BVSetActiveColumns(ctx->S,0,nep->nconv));
465
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158 PetscCall(BVCopy(ctx->S,nep->V));
466 }
467 max_error = 0.0;
468
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1035 for (i=0;i<nep->nconv;i++) {
469
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837 PetscCall(BVGetColumn(nep->V,i,&si));
470
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837 PetscCall(VecNormalize(si,NULL));
471
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837 PetscCall(NEPComputeResidualNorm_Private(nep,PETSC_FALSE,nep->eigr[i],si,nep->work,&error));
472
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837 PetscCall((*nep->converged)(nep,nep->eigr[i],0,error,&error,nep->convergedctx));
473
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837 PetscCall(BVRestoreColumn(nep->V,i,&si));
474
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1122 max_error = PetscMax(max_error,error);
475 }
476
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198 if (max_error <= nep->tol) nep->reason = NEP_CONVERGED_TOL;
477
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1 else if (nep->its > nep->max_it) nep->reason = NEP_DIVERGED_ITS;
478 else {
479
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1 if (nep->nconv > ctx->L) nv = nep->nconv;
480
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1 else if (ctx->L > nv) nv = ctx->L;
481 1 nv = PetscMin(nv,ctx->L*ctx->M);
482
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1 PetscCall(MatCreateSeqDense(PETSC_COMM_SELF,nv,ctx->L,NULL,&M));
483
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1 PetscCall(MatSetRandom(M,rand));
484
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1 PetscCall(BVSetActiveColumns(ctx->S,0,nv));
485
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1 PetscCall(BVMultInPlace(ctx->S,M,0,ctx->L));
486
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1 PetscCall(MatDestroy(&M));
487
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1 PetscCall(BVSetActiveColumns(ctx->S,0,ctx->L));
488
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1 PetscCall(BVSetActiveColumns(ctx->V,0,ctx->L));
489
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1 PetscCall(BVCopy(ctx->S,ctx->V));
490
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1 if (contour->pA) PetscCall(BVScatter(ctx->V,ctx->pV,contour->scatterin,contour->xdup));
491
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396 PetscCall(NEPCISSSolve(nep,J,V,0,ctx->L));
492 }
493 }
494 }
495
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197 PetscCall(PetscFree2(Mu,H0));
496
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197 if (ctx->extraction == NEP_CISS_EXTRACTION_HANKEL) PetscCall(PetscFree(H1));
497
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40 PetscFunctionReturn(PETSC_SUCCESS);
498 }
499
500 190 static PetscErrorCode NEPCISSSetSizes_CISS(NEP nep,PetscInt ip,PetscInt bs,PetscInt ms,PetscInt npart,PetscInt bsmax,PetscBool realmats)
501 {
502 190 NEP_CISS *ctx = (NEP_CISS*)nep->data;
503 190 PetscInt oN,oL,oM,oLmax,onpart;
504 190 PetscMPIInt size;
505
506
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190 PetscFunctionBegin;
507 190 oN = ctx->N;
508
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190 if (ip == PETSC_DETERMINE) {
509
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65 if (ctx->N!=32) { ctx->N =32; ctx->M = ctx->N/4; }
510
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125 } else if (ip != PETSC_CURRENT) {
511
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125 PetscCheck(ip>0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The ip argument must be > 0");
512
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125 PetscCheck(ip%2==0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The ip argument must be an even number");
513
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125 if (ctx->N!=ip) { ctx->N = ip; ctx->M = ctx->N/4; }
514 }
515 190 oL = ctx->L;
516
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190 if (bs == PETSC_DETERMINE) {
517 65 ctx->L = 16;
518
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125 } else if (bs != PETSC_CURRENT) {
519
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125 PetscCheck(bs>0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The bs argument must be > 0");
520 125 ctx->L = bs;
521 }
522 190 oM = ctx->M;
523
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190 if (ms == PETSC_DETERMINE) {
524 65 ctx->M = ctx->N/4;
525
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125 } else if (ms != PETSC_CURRENT) {
526
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125 PetscCheck(ms>0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The ms argument must be > 0");
527
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125 PetscCheck(ms<=ctx->N,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The ms argument must be less than or equal to the number of integration points");
528 125 ctx->M = ms;
529 }
530 190 onpart = ctx->npart;
531
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190 if (npart == PETSC_DETERMINE) {
532 ctx->npart = 1;
533
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190 } else if (npart != PETSC_CURRENT) {
534
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190 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)nep),&size));
535
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190 PetscCheck(npart>0 && npart<=size,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"Illegal value of npart");
536 190 ctx->npart = npart;
537 }
538 190 oLmax = ctx->L_max;
539
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190 if (bsmax == PETSC_DETERMINE) {
540 65 ctx->L_max = 64;
541
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125 } else if (bsmax != PETSC_CURRENT) {
542
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125 PetscCheck(bsmax>0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The bsmax argument must be > 0");
543 125 ctx->L_max = PetscMax(bsmax,ctx->L);
544 }
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190 if (onpart != ctx->npart || oN != ctx->N || realmats != ctx->isreal) {
546
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155 PetscCall(SlepcContourDataDestroy(&ctx->contour));
547
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155 PetscCall(PetscInfo(nep,"Resetting the contour data structure due to a change of parameters\n"));
548 155 nep->state = NEP_STATE_INITIAL;
549 }
550 190 ctx->isreal = realmats;
551
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190 if (oL != ctx->L || oM != ctx->M || oLmax != ctx->L_max) nep->state = NEP_STATE_INITIAL;
552
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38 PetscFunctionReturn(PETSC_SUCCESS);
553 }
554
555 /*@
556 NEPCISSSetSizes - Sets the values of various size parameters in the CISS solver.
557
558 Logically Collective
559
560 Input Parameters:
561 + nep - the nonlinear eigensolver context
562 . ip - number of integration points
563 . bs - block size
564 . ms - moment size
565 . npart - number of partitions when splitting the communicator
566 . bsmax - max block size
567 - realmats - $T(z)$ is real for real $z$
568
569 Options Database Keys:
570 + -nep_ciss_integration_points \<ip\> - sets the number of integration points
571 . -nep_ciss_blocksize \<bs\> - sets the block size
572 . -nep_ciss_moments \<ms\> - sets the moment size
573 . -nep_ciss_partitions \<npart\> - sets the number of partitions
574 . -nep_ciss_maxblocksize \<bsmax\> - sets the maximum block size
575 - -nep_ciss_realmats - $T(z)$ is real for real $z$
576
577 Notes:
578 For all integer arguments, you can use `PETSC_CURRENT` to keep the current value, and
579 `PETSC_DETERMINE` to set them to a default value.
580
581 The default number of partitions is 1. This means the internal `KSP` object is shared
582 among all processes of the `NEP` communicator. Otherwise, the communicator is split
583 into `npart` communicators, so that `npart` `KSP` solves proceed simultaneously.
584
585 The `realmats` flag can be set to `PETSC_TRUE` when $T(\cdot)$ is guaranteed to be real
586 when the argument is a real value, for example, when all matrices in
587 the split form are real. When set to `PETSC_TRUE`, the solver avoids some computations.
588
589 For a detailed description of the parameters see {cite:p}`Mae16`.
590
591 Level: advanced
592
593 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSGetSizes()`
594 @*/
595 190 PetscErrorCode NEPCISSSetSizes(NEP nep,PetscInt ip,PetscInt bs,PetscInt ms,PetscInt npart,PetscInt bsmax,PetscBool realmats)
596 {
597
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190 PetscFunctionBegin;
598
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190 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
599
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190 PetscValidLogicalCollectiveInt(nep,ip,2);
600
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190 PetscValidLogicalCollectiveInt(nep,bs,3);
601
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190 PetscValidLogicalCollectiveInt(nep,ms,4);
602
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190 PetscValidLogicalCollectiveInt(nep,npart,5);
603
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190 PetscValidLogicalCollectiveInt(nep,bsmax,6);
604
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190 PetscValidLogicalCollectiveBool(nep,realmats,7);
605
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190 PetscTryMethod(nep,"NEPCISSSetSizes_C",(NEP,PetscInt,PetscInt,PetscInt,PetscInt,PetscInt,PetscBool),(nep,ip,bs,ms,npart,bsmax,realmats));
606
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190 PetscFunctionReturn(PETSC_SUCCESS);
607 }
608
609 187 static PetscErrorCode NEPCISSGetSizes_CISS(NEP nep,PetscInt *ip,PetscInt *bs,PetscInt *ms,PetscInt *npart,PetscInt *bsmax,PetscBool *realmats)
610 {
611 187 NEP_CISS *ctx = (NEP_CISS*)nep->data;
612
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187 PetscFunctionBegin;
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187 if (ip) *ip = ctx->N;
615
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187 if (bs) *bs = ctx->L;
616
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187 if (ms) *ms = ctx->M;
617
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187 if (npart) *npart = ctx->npart;
618
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187 if (bsmax) *bsmax = ctx->L_max;
619
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187 if (realmats) *realmats = ctx->isreal;
620
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187 PetscFunctionReturn(PETSC_SUCCESS);
621 }
622
623 /*@
624 NEPCISSGetSizes - Gets the values of various size parameters in the CISS solver.
625
626 Not Collective
627
628 Input Parameter:
629 . nep - the nonlinear eigensolver context
630
631 Output Parameters:
632 + ip - number of integration points
633 . bs - block size
634 . ms - moment size
635 . npart - number of partitions when splitting the communicator
636 . bsmax - max block size
637 - realmats - $T(z)$ is real for real $z$
638
639 Level: advanced
640
641 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSSetSizes()`
642 @*/
643 187 PetscErrorCode NEPCISSGetSizes(NEP nep,PetscInt *ip,PetscInt *bs,PetscInt *ms,PetscInt *npart,PetscInt *bsmax,PetscBool *realmats)
644 {
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187 PetscFunctionBegin;
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187 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
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187 PetscUseMethod(nep,"NEPCISSGetSizes_C",(NEP,PetscInt*,PetscInt*,PetscInt*,PetscInt*,PetscInt*,PetscBool*),(nep,ip,bs,ms,npart,bsmax,realmats));
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187 PetscFunctionReturn(PETSC_SUCCESS);
649 }
650
651 15 static PetscErrorCode NEPCISSSetThreshold_CISS(NEP nep,PetscReal delta,PetscReal spur)
652 {
653 15 NEP_CISS *ctx = (NEP_CISS*)nep->data;
654
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15 PetscFunctionBegin;
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15 if (delta == (PetscReal)PETSC_DETERMINE) {
657 ctx->delta = SLEPC_DEFAULT_TOL*1e-4;
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15 } else if (delta != (PetscReal)PETSC_CURRENT) {
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15 PetscCheck(delta>0.0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The delta argument must be > 0.0");
660 15 ctx->delta = delta;
661 }
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15 if (spur == (PetscReal)PETSC_DETERMINE) {
663 ctx->spurious_threshold = PetscSqrtReal(SLEPC_DEFAULT_TOL);
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15 } else if (spur != (PetscReal)PETSC_CURRENT) {
665
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15 PetscCheck(spur>0.0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The spurious threshold argument must be > 0.0");
666 15 ctx->spurious_threshold = spur;
667 }
668
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3 PetscFunctionReturn(PETSC_SUCCESS);
669 }
670
671 /*@
672 NEPCISSSetThreshold - Sets the values of various threshold parameters in
673 the CISS solver.
674
675 Logically Collective
676
677 Input Parameters:
678 + nep - the nonlinear eigensolver context
679 . delta - threshold for numerical rank
680 - spur - spurious threshold (to discard spurious eigenpairs)
681
682 Options Database Keys:
683 + -nep_ciss_delta \<delta\> - sets the delta
684 - -nep_ciss_spurious_threshold \<spur\> - sets the spurious threshold
685
686 Notes:
687 `PETSC_CURRENT` can be used to preserve the current value of any of the
688 arguments, and `PETSC_DETERMINE` to set them to a default value.
689
690 For a detailed description of the parameters see {cite:p}`Mae16`.
691
692 Level: advanced
693
694 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSGetThreshold()`
695 @*/
696 15 PetscErrorCode NEPCISSSetThreshold(NEP nep,PetscReal delta,PetscReal spur)
697 {
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15 PetscFunctionBegin;
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15 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
700
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15 PetscValidLogicalCollectiveReal(nep,delta,2);
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15 PetscValidLogicalCollectiveReal(nep,spur,3);
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15 PetscTryMethod(nep,"NEPCISSSetThreshold_C",(NEP,PetscReal,PetscReal),(nep,delta,spur));
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15 PetscFunctionReturn(PETSC_SUCCESS);
704 }
705
706 187 static PetscErrorCode NEPCISSGetThreshold_CISS(NEP nep,PetscReal *delta,PetscReal *spur)
707 {
708 187 NEP_CISS *ctx = (NEP_CISS*)nep->data;
709
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187 PetscFunctionBegin;
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187 if (delta) *delta = ctx->delta;
712
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187 if (spur) *spur = ctx->spurious_threshold;
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187 PetscFunctionReturn(PETSC_SUCCESS);
714 }
715
716 /*@
717 NEPCISSGetThreshold - Gets the values of various threshold parameters in
718 the CISS solver.
719
720 Not Collective
721
722 Input Parameter:
723 . nep - the nonlinear eigensolver context
724
725 Output Parameters:
726 + delta - threshold for numerical rank
727 - spur - spurious threshold (to discard spurious eigenpairs)
728
729 Level: advanced
730
731 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSSetThreshold()`
732 @*/
733 187 PetscErrorCode NEPCISSGetThreshold(NEP nep,PetscReal *delta,PetscReal *spur)
734 {
735
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187 PetscFunctionBegin;
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187 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
737
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187 PetscUseMethod(nep,"NEPCISSGetThreshold_C",(NEP,PetscReal*,PetscReal*),(nep,delta,spur));
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187 PetscFunctionReturn(PETSC_SUCCESS);
739 }
740
741 15 static PetscErrorCode NEPCISSSetRefinement_CISS(NEP nep,PetscInt inner,PetscInt blsize)
742 {
743 15 NEP_CISS *ctx = (NEP_CISS*)nep->data;
744
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15 PetscFunctionBegin;
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15 if (inner == PETSC_DETERMINE) {
747 ctx->refine_inner = 0;
748
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15 } else if (inner != PETSC_CURRENT) {
749
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15 PetscCheck(inner>=0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The refine inner argument must be >= 0");
750 15 ctx->refine_inner = inner;
751 }
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15 if (blsize == PETSC_DETERMINE) {
753 ctx->refine_blocksize = 0;
754
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15 } else if (blsize != PETSC_CURRENT) {
755
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15 PetscCheck(blsize>=0,PetscObjectComm((PetscObject)nep),PETSC_ERR_ARG_OUTOFRANGE,"The refine blocksize argument must be >= 0");
756 15 ctx->refine_blocksize = blsize;
757 }
758
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3 PetscFunctionReturn(PETSC_SUCCESS);
759 }
760
761 /*@
762 NEPCISSSetRefinement - Sets the values of various refinement parameters
763 in the CISS solver.
764
765 Logically Collective
766
767 Input Parameters:
768 + nep - the nonlinear eigensolver context
769 . inner - number of iterative refinement iterations (inner loop)
770 - blsize - number of iterative refinement iterations (blocksize loop)
771
772 Options Database Keys:
773 + -nep_ciss_refine_inner \<inner\> - sets number of inner iterations
774 - -nep_ciss_refine_blocksize \<blsize\> - sets number of blocksize iterations
775
776 Note:
777 `PETSC_CURRENT` can be used to preserve the current value of any of the
778 arguments, and `PETSC_DETERMINE` to set them to a default of 0 (no refinement).
779
780 Level: advanced
781
782 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSGetRefinement()`
783 @*/
784 15 PetscErrorCode NEPCISSSetRefinement(NEP nep,PetscInt inner,PetscInt blsize)
785 {
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15 PetscFunctionBegin;
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15 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
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15 PetscValidLogicalCollectiveInt(nep,inner,2);
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15 PetscValidLogicalCollectiveInt(nep,blsize,3);
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15 PetscTryMethod(nep,"NEPCISSSetRefinement_C",(NEP,PetscInt,PetscInt),(nep,inner,blsize));
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15 PetscFunctionReturn(PETSC_SUCCESS);
792 }
793
794 187 static PetscErrorCode NEPCISSGetRefinement_CISS(NEP nep,PetscInt *inner,PetscInt *blsize)
795 {
796 187 NEP_CISS *ctx = (NEP_CISS*)nep->data;
797
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187 PetscFunctionBegin;
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187 if (inner) *inner = ctx->refine_inner;
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187 if (blsize) *blsize = ctx->refine_blocksize;
801
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187 PetscFunctionReturn(PETSC_SUCCESS);
802 }
803
804 /*@
805 NEPCISSGetRefinement - Gets the values of various refinement parameters
806 in the CISS solver.
807
808 Not Collective
809
810 Input Parameter:
811 . nep - the nonlinear eigensolver context
812
813 Output Parameters:
814 + inner - number of iterative refinement iterations (inner loop)
815 - blsize - number of iterative refinement iterations (blocksize loop)
816
817 Level: advanced
818
819 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSSetRefinement()`
820 @*/
821 187 PetscErrorCode NEPCISSGetRefinement(NEP nep, PetscInt *inner, PetscInt *blsize)
822 {
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187 PetscFunctionBegin;
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187 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
825
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187 PetscUseMethod(nep,"NEPCISSGetRefinement_C",(NEP,PetscInt*,PetscInt*),(nep,inner,blsize));
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187 PetscFunctionReturn(PETSC_SUCCESS);
827 }
828
829 120 static PetscErrorCode NEPCISSSetExtraction_CISS(NEP nep,NEPCISSExtraction extraction)
830 {
831 120 NEP_CISS *ctx = (NEP_CISS*)nep->data;
832
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120 PetscFunctionBegin;
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120 if (ctx->extraction != extraction) {
835 80 ctx->extraction = extraction;
836 80 nep->state = NEP_STATE_INITIAL;
837 }
838
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120 PetscFunctionReturn(PETSC_SUCCESS);
839 }
840
841 /*@
842 NEPCISSSetExtraction - Sets the extraction technique used in the CISS solver.
843
844 Logically Collective
845
846 Input Parameters:
847 + nep - the nonlinear eigensolver context
848 - extraction - the extraction technique, see `NEPCISSExtraction` for possible values
849
850 Options Database Key:
851 . -nep_ciss_extraction \<extraction\> - Sets the extraction technique, either `ritz`, `hankel` or `caa`
852
853 Notes:
854 By default, the Rayleigh-Ritz extraction is used (`NEP_CISS_EXTRACTION_RITZ`).
855
856 If the `hankel` or the `caa` option is specified (`NEP_CISS_EXTRACTION_HANKEL` or
857 `NEP_CISS_EXTRACTION_CAA`), then the block Hankel method, or the communication-avoiding
858 Arnoldi method, respectively, is used for extracting eigenpairs.
859
860 Level: advanced
861
862 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSGetExtraction()`, `NEPCISSExtraction`
863 @*/
864 120 PetscErrorCode NEPCISSSetExtraction(NEP nep,NEPCISSExtraction extraction)
865 {
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120 PetscFunctionBegin;
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120 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
868
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120 PetscValidLogicalCollectiveEnum(nep,extraction,2);
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120 PetscTryMethod(nep,"NEPCISSSetExtraction_C",(NEP,NEPCISSExtraction),(nep,extraction));
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120 PetscFunctionReturn(PETSC_SUCCESS);
871 }
872
873 65 static PetscErrorCode NEPCISSGetExtraction_CISS(NEP nep,NEPCISSExtraction *extraction)
874 {
875 65 NEP_CISS *ctx = (NEP_CISS*)nep->data;
876
877
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65 PetscFunctionBegin;
878 65 *extraction = ctx->extraction;
879
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65 PetscFunctionReturn(PETSC_SUCCESS);
880 }
881
882 /*@
883 NEPCISSGetExtraction - Gets the extraction technique used in the CISS solver.
884
885 Not Collective
886
887 Input Parameter:
888 . nep - the nonlinear eigensolver context
889
890 Output Parameter:
891 . extraction - extraction technique
892
893 Level: advanced
894
895 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSSetExtraction()`, `NEPCISSExtraction`
896 @*/
897 65 PetscErrorCode NEPCISSGetExtraction(NEP nep,NEPCISSExtraction *extraction)
898 {
899
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65 PetscFunctionBegin;
900
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65 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
901
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65 PetscAssertPointer(extraction,2);
902
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65 PetscUseMethod(nep,"NEPCISSGetExtraction_C",(NEP,NEPCISSExtraction*),(nep,extraction));
903
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65 PetscFunctionReturn(PETSC_SUCCESS);
904 }
905
906 217 static PetscErrorCode NEPCISSGetKSPs_CISS(NEP nep,PetscInt *nsolve,KSP **ksp)
907 {
908 217 NEP_CISS *ctx = (NEP_CISS*)nep->data;
909 217 SlepcContourData contour;
910 217 PetscInt i;
911 217 PC pc;
912 217 MPI_Comm child;
913
914
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217 PetscFunctionBegin;
915
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217 if (!ctx->contour) { /* initialize contour data structure first */
916
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217 PetscCall(RGCanUseConjugates(nep->rg,ctx->isreal,&ctx->useconj));
917
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217 PetscCall(SlepcContourDataCreate(ctx->useconj?ctx->N/2:ctx->N,ctx->npart,(PetscObject)nep,&ctx->contour));
918 }
919 217 contour = ctx->contour;
920
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217 if (!contour->ksp) {
921
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217 PetscCall(PetscMalloc1(contour->npoints,&contour->ksp));
922
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217 PetscCall(PetscSubcommGetChild(contour->subcomm,&child));
923
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4281 for (i=0;i<contour->npoints;i++) {
924
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4064 PetscCall(KSPCreate(child,&contour->ksp[i]));
925
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4064 PetscCall(PetscObjectIncrementTabLevel((PetscObject)contour->ksp[i],(PetscObject)nep,1));
926
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4064 PetscCall(KSPSetOptionsPrefix(contour->ksp[i],((PetscObject)nep)->prefix));
927
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4064 PetscCall(KSPAppendOptionsPrefix(contour->ksp[i],"nep_ciss_"));
928
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4064 PetscCall(PetscObjectSetOptions((PetscObject)contour->ksp[i],((PetscObject)nep)->options));
929
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4064 PetscCall(KSPSetErrorIfNotConverged(contour->ksp[i],PETSC_TRUE));
930
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6016 PetscCall(KSPSetTolerances(contour->ksp[i],SlepcDefaultTol(nep->tol),PETSC_CURRENT,PETSC_CURRENT,PETSC_CURRENT));
931
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4064 PetscCall(KSPGetPC(contour->ksp[i],&pc));
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4064 if ((nep->fui==NEP_USER_INTERFACE_SPLIT && nep->P) || (nep->fui==NEP_USER_INTERFACE_CALLBACK && nep->function_pre!=nep->function)) {
933
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480 PetscCall(KSPSetType(contour->ksp[i],KSPBCGS));
934
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480 PetscCall(PCSetType(pc,PCBJACOBI));
935 } else {
936
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3584 PetscCall(KSPSetType(contour->ksp[i],KSPPREONLY));
937
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4064 PetscCall(PCSetType(pc,PCLU));
938 }
939 }
940 }
941
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217 if (nsolve) *nsolve = contour->npoints;
942
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217 if (ksp) *ksp = contour->ksp;
943
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44 PetscFunctionReturn(PETSC_SUCCESS);
944 }
945
946 /*@C
947 NEPCISSGetKSPs - Retrieve the array of linear solver objects associated with
948 the CISS solver.
949
950 Collective
951
952 Input Parameter:
953 . nep - the nonlinear eigensolver context
954
955 Output Parameters:
956 + nsolve - number of solver objects
957 - ksp - array of linear solver object
958
959 Notes:
960 The number of `KSP` solvers is equal to the number of integration points divided by
961 the number of partitions. This value is halved in the case of real matrices with
962 a region centered at the real axis.
963
964 Level: advanced
965
966 .seealso: [](ch:nep), `NEPCISS`, `NEPCISSSetSizes()`
967 @*/
968 217 PetscErrorCode NEPCISSGetKSPs(NEP nep,PetscInt *nsolve,KSP **ksp)
969 {
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217 PetscFunctionBegin;
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217 PetscValidHeaderSpecific(nep,NEP_CLASSID,1);
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217 PetscUseMethod(nep,"NEPCISSGetKSPs_C",(NEP,PetscInt*,KSP**),(nep,nsolve,ksp));
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217 PetscFunctionReturn(PETSC_SUCCESS);
974 }
975
976 197 static PetscErrorCode NEPReset_CISS(NEP nep)
977 {
978 197 NEP_CISS *ctx = (NEP_CISS*)nep->data;
979
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197 PetscFunctionBegin;
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197 PetscCall(BVDestroy(&ctx->S));
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197 PetscCall(BVDestroy(&ctx->V));
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197 PetscCall(BVDestroy(&ctx->Y));
984
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197 PetscCall(SlepcContourDataReset(ctx->contour));
985
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197 PetscCall(MatDestroy(&ctx->J));
986
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197 PetscCall(BVDestroy(&ctx->pV));
987
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197 if (ctx->extraction == NEP_CISS_EXTRACTION_RITZ && nep->fui==NEP_USER_INTERFACE_CALLBACK) PetscCall(PetscFree(ctx->dsctxf));
988
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40 PetscFunctionReturn(PETSC_SUCCESS);
989 }
990
991 187 static PetscErrorCode NEPSetFromOptions_CISS(NEP nep,PetscOptionItems PetscOptionsObject)
992 {
993 187 NEP_CISS *ctx = (NEP_CISS*)nep->data;
994 187 PetscReal r1,r2;
995 187 PetscInt i,i1,i2,i3,i4,i5,i6,i7;
996 187 PetscBool b1,flg,flg2,flg3,flg4,flg5,flg6;
997 187 NEPCISSExtraction extraction;
998
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187 PetscFunctionBegin;
1000
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187 PetscOptionsHeadBegin(PetscOptionsObject,"NEP CISS Options");
1001
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187 PetscCall(NEPCISSGetSizes(nep,&i1,&i2,&i3,&i4,&i5,&b1));
1003
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187 PetscCall(PetscOptionsInt("-nep_ciss_integration_points","Number of integration points","NEPCISSSetSizes",i1,&i1,&flg));
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187 PetscCall(PetscOptionsInt("-nep_ciss_blocksize","Block size","NEPCISSSetSizes",i2,&i2,&flg2));
1005
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187 PetscCall(PetscOptionsInt("-nep_ciss_moments","Moment size","NEPCISSSetSizes",i3,&i3,&flg3));
1006
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187 PetscCall(PetscOptionsInt("-nep_ciss_partitions","Number of partitions","NEPCISSSetSizes",i4,&i4,&flg4));
1007
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187 PetscCall(PetscOptionsInt("-nep_ciss_maxblocksize","Maximum block size","NEPCISSSetSizes",i5,&i5,&flg5));
1008
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187 PetscCall(PetscOptionsBool("-nep_ciss_realmats","True if T(z) is real for real z","NEPCISSSetSizes",b1,&b1,&flg6));
1009
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187 if (flg || flg2 || flg3 || flg4 || flg5 || flg6) PetscCall(NEPCISSSetSizes(nep,i1,i2,i3,i4,i5,b1));
1010
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187 PetscCall(NEPCISSGetThreshold(nep,&r1,&r2));
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187 PetscCall(PetscOptionsReal("-nep_ciss_delta","Threshold for numerical rank","NEPCISSSetThreshold",r1,&r1,&flg));
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187 PetscCall(PetscOptionsReal("-nep_ciss_spurious_threshold","Threshold for the spurious eigenpairs","NEPCISSSetThreshold",r2,&r2,&flg2));
1014
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187 if (flg || flg2) PetscCall(NEPCISSSetThreshold(nep,r1,r2));
1015
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187 PetscCall(NEPCISSGetRefinement(nep,&i6,&i7));
1017
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187 PetscCall(PetscOptionsInt("-nep_ciss_refine_inner","Number of inner iterative refinement iterations","NEPCISSSetRefinement",i6,&i6,&flg));
1018
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187 PetscCall(PetscOptionsInt("-nep_ciss_refine_blocksize","Number of blocksize iterative refinement iterations","NEPCISSSetRefinement",i7,&i7,&flg2));
1019
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187 if (flg || flg2) PetscCall(NEPCISSSetRefinement(nep,i6,i7));
1020
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187 PetscCall(PetscOptionsEnum("-nep_ciss_extraction","Extraction technique","NEPCISSSetExtraction",NEPCISSExtractions,(PetscEnum)ctx->extraction,(PetscEnum*)&extraction,&flg));
1022
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187 if (flg) PetscCall(NEPCISSSetExtraction(nep,extraction));
1023
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187 PetscOptionsHeadEnd();
1025
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187 if (!nep->rg) PetscCall(NEPGetRG(nep,&nep->rg));
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187 PetscCall(RGSetFromOptions(nep->rg)); /* this is necessary here to set useconj */
1028
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187 if (!ctx->contour || !ctx->contour->ksp) PetscCall(NEPCISSGetKSPs(nep,NULL,NULL));
1029
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38 PetscAssert(ctx->contour && ctx->contour->ksp,PetscObjectComm((PetscObject)nep),PETSC_ERR_PLIB,"Something went wrong with NEPCISSGetKSPs()");
1030
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3771 for (i=0;i<ctx->contour->npoints;i++) PetscCall(KSPSetFromOptions(ctx->contour->ksp[i]));
1031
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187 PetscCall(PetscSubcommSetFromOptions(ctx->contour->subcomm));
1032
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38 PetscFunctionReturn(PETSC_SUCCESS);
1033 }
1034
1035 187 static PetscErrorCode NEPDestroy_CISS(NEP nep)
1036 {
1037 187 NEP_CISS *ctx = (NEP_CISS*)nep->data;
1038
1039
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187 PetscFunctionBegin;
1040
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187 PetscCall(SlepcContourDataDestroy(&ctx->contour));
1041
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187 PetscCall(PetscFree4(ctx->weight,ctx->omega,ctx->pp,ctx->sigma));
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187 PetscCall(PetscFree(nep->data));
1043
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetSizes_C",NULL));
1044
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetSizes_C",NULL));
1045
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetThreshold_C",NULL));
1046
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetThreshold_C",NULL));
1047
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetRefinement_C",NULL));
1048
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetRefinement_C",NULL));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetExtraction_C",NULL));
1050
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetExtraction_C",NULL));
1051
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetKSPs_C",NULL));
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38 PetscFunctionReturn(PETSC_SUCCESS);
1053 }
1054
1055 5 static PetscErrorCode NEPView_CISS(NEP nep,PetscViewer viewer)
1056 {
1057 5 NEP_CISS *ctx = (NEP_CISS*)nep->data;
1058 5 PetscBool isascii;
1059 5 PetscViewer sviewer;
1060
1061
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5 PetscFunctionBegin;
1062
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5 PetscCall(PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii));
1063
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5 if (isascii) {
1064
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5 PetscCall(PetscViewerASCIIPrintf(viewer," sizes { integration points: %" PetscInt_FMT ", block size: %" PetscInt_FMT ", moment size: %" PetscInt_FMT ", partitions: %" PetscInt_FMT ", maximum block size: %" PetscInt_FMT " }\n",ctx->N,ctx->L,ctx->M,ctx->npart,ctx->L_max));
1065
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5 if (ctx->isreal) PetscCall(PetscViewerASCIIPrintf(viewer," exploiting symmetry of integration points\n"));
1066
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5 PetscCall(PetscViewerASCIIPrintf(viewer," threshold { delta: %g, spurious threshold: %g }\n",(double)ctx->delta,(double)ctx->spurious_threshold));
1067
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5 PetscCall(PetscViewerASCIIPrintf(viewer," iterative refinement { inner: %" PetscInt_FMT ", blocksize: %" PetscInt_FMT " }\n",ctx->refine_inner, ctx->refine_blocksize));
1068
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5 PetscCall(PetscViewerASCIIPrintf(viewer," extraction: %s\n",NEPCISSExtractions[ctx->extraction]));
1069
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5 if (!ctx->contour || !ctx->contour->ksp) PetscCall(NEPCISSGetKSPs(nep,NULL,NULL));
1070
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5 PetscAssert(ctx->contour && ctx->contour->ksp,PetscObjectComm((PetscObject)nep),PETSC_ERR_PLIB,"Something went wrong with NEPCISSGetKSPs()");
1071
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5 PetscCall(PetscViewerASCIIPushTab(viewer));
1072
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5 if (ctx->npart>1 && ctx->contour->subcomm) {
1073 PetscCall(PetscViewerGetSubViewer(viewer,ctx->contour->subcomm->child,&sviewer));
1074 if (!ctx->contour->subcomm->color) PetscCall(KSPView(ctx->contour->ksp[0],sviewer));
1075 PetscCall(PetscViewerFlush(sviewer));
1076 PetscCall(PetscViewerRestoreSubViewer(viewer,ctx->contour->subcomm->child,&sviewer));
1077 /* extra call needed because of the two calls to PetscViewerASCIIPushSynchronized() in PetscViewerGetSubViewer() */
1078 PetscCall(PetscViewerASCIIPopSynchronized(viewer));
1079
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5 } else PetscCall(KSPView(ctx->contour->ksp[0],viewer));
1080
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5 PetscCall(PetscViewerASCIIPopTab(viewer));
1081 }
1082
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1 PetscFunctionReturn(PETSC_SUCCESS);
1083 }
1084
1085 384 static PetscErrorCode NEPSetDSType_CISS(NEP nep)
1086 {
1087 384 NEP_CISS *ctx = (NEP_CISS*)nep->data;
1088
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384 PetscFunctionBegin;
1090
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384 switch (ctx->extraction) {
1091
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224 case NEP_CISS_EXTRACTION_RITZ: PetscCall(DSSetType(nep->ds,DSNEP)); break;
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80 case NEP_CISS_EXTRACTION_HANKEL: PetscCall(DSSetType(nep->ds,DSGNHEP)); break;
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80 case NEP_CISS_EXTRACTION_CAA: PetscCall(DSSetType(nep->ds,DSNHEP)); break;
1094 }
1095
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78 PetscFunctionReturn(PETSC_SUCCESS);
1096 }
1097
1098 /*MC
1099 NEPCISS - NEPCISS = "ciss" - A contour integral eigensolver based on the
1100 Sakurai-Sugiura scheme.
1101
1102 Notes:
1103 This solver is based on the numerical contour integration idea
1104 proposed initially for linear problems by {cite:t}`Sak03`. In nonlinear
1105 eigenproblems, a Rayleigh-Ritz projection is done, resulting in
1106 a small dense nonlinear eigenproblem {cite:p}`Asa09,Yok13`.
1107
1108 Contour integral methods are able to compute all eigenvalues
1109 lying inside a region of the complex plane. Use `NEPGetRG()` to
1110 specify the region. However, the computational cost is usually high
1111 because multiple linear systems must be solved. Use `NEPCISSGetKSPs()`
1112 to configure the `KSP` objects for this.
1113
1114 Details of the implementation in SLEPc can be found in {cite:p}`Mae16`.
1115
1116 Level: beginner
1117
1118 .seealso: [](ch:nep), `NEP`, `NEPType`, `NEPSetType()`, `NEPGetRG()`
1119 M*/
1120 187 SLEPC_EXTERN PetscErrorCode NEPCreate_CISS(NEP nep)
1121 {
1122 187 NEP_CISS *ctx = (NEP_CISS*)nep->data;
1123
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187 PetscFunctionBegin;
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187 PetscCall(PetscNew(&ctx));
1126 187 nep->data = ctx;
1127 /* set default values of parameters */
1128 187 ctx->N = 32;
1129 187 ctx->L = 16;
1130 187 ctx->M = ctx->N/4;
1131 187 ctx->delta = SLEPC_DEFAULT_TOL*1e-4;
1132 187 ctx->L_max = 64;
1133 187 ctx->spurious_threshold = PetscSqrtReal(SLEPC_DEFAULT_TOL);
1134 187 ctx->isreal = PETSC_FALSE;
1135 187 ctx->npart = 1;
1136
1137 187 nep->useds = PETSC_TRUE;
1138
1139 187 nep->ops->solve = NEPSolve_CISS;
1140 187 nep->ops->setup = NEPSetUp_CISS;
1141 187 nep->ops->setfromoptions = NEPSetFromOptions_CISS;
1142 187 nep->ops->reset = NEPReset_CISS;
1143 187 nep->ops->destroy = NEPDestroy_CISS;
1144 187 nep->ops->view = NEPView_CISS;
1145 187 nep->ops->setdstype = NEPSetDSType_CISS;
1146
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetSizes_C",NEPCISSSetSizes_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetSizes_C",NEPCISSGetSizes_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetThreshold_C",NEPCISSSetThreshold_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetThreshold_C",NEPCISSGetThreshold_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetRefinement_C",NEPCISSSetRefinement_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetRefinement_C",NEPCISSGetRefinement_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSSetExtraction_C",NEPCISSSetExtraction_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetExtraction_C",NEPCISSGetExtraction_CISS));
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187 PetscCall(PetscObjectComposeFunction((PetscObject)nep,"NEPCISSGetKSPs_C",NEPCISSGetKSPs_CISS));
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38 PetscFunctionReturn(PETSC_SUCCESS);
1157 }
1158