GCC Code Coverage Report


Directory: ./
File: src/sys/classes/ds/impls/pep/dspep.c
Date: 2026-10-22 02:08:06
Exec Total Coverage
Lines: 288 292 98.6%
Functions: 17 17 100.0%
Branches: 903 1824 49.5%

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 #include <slepc/private/dsimpl.h> /*I "slepcds.h" I*/
12 #include <slepcblaslapack.h>
13
14 typedef struct {
15 PetscInt d; /* polynomial degree */
16 PetscReal *pbc; /* polynomial basis coefficients */
17 } DS_PEP;
18
19 185 static PetscErrorCode DSAllocate_PEP(DS ds,PetscInt ld)
20 {
21 185 DS_PEP *ctx = (DS_PEP*)ds->data;
22 185 PetscInt i;
23
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185 PetscFunctionBegin;
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185 PetscCheck(ctx->d,PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_WRONGSTATE,"DSPEP requires specifying the polynomial degree via DSPEPSetDegree()");
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185 PetscCall(DSAllocateMat_Private(ds,DS_MAT_X));
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185 PetscCall(DSAllocateMat_Private(ds,DS_MAT_Y));
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820 for (i=0;i<=ctx->d;i++) PetscCall(DSAllocateMat_Private(ds,DSMatExtra[i]));
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185 PetscCall(PetscFree(ds->perm));
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185 PetscCall(PetscMalloc1(ld*ctx->d,&ds->perm));
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37 PetscFunctionReturn(PETSC_SUCCESS);
32 }
33
34 20 static PetscErrorCode DSView_PEP(DS ds,PetscViewer viewer)
35 {
36 20 DS_PEP *ctx = (DS_PEP*)ds->data;
37 20 PetscViewerFormat format;
38 20 PetscInt i;
39
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20 PetscFunctionBegin;
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20 PetscCall(PetscViewerGetFormat(viewer,&format));
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20 if (format == PETSC_VIEWER_ASCII_INFO) PetscFunctionReturn(PETSC_SUCCESS);
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20 if (format == PETSC_VIEWER_ASCII_INFO_DETAIL) {
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20 PetscCall(PetscViewerASCIIPrintf(viewer,"polynomial degree: %" PetscInt_FMT "\n",ctx->d));
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4 PetscFunctionReturn(PETSC_SUCCESS);
46 }
47 ✗ for (i=0;i<=ctx->d;i++) PetscCall(DSViewMat(ds,viewer,DSMatExtra[i]));
48 ✗ if (ds->state>DS_STATE_INTERMEDIATE) PetscCall(DSViewMat(ds,viewer,DS_MAT_X));
49 ✗ PetscFunctionReturn(PETSC_SUCCESS);
50 }
51
52 130 static PetscErrorCode DSVectors_PEP(DS ds,DSMatType mat,PetscInt *j,PetscReal *rnorm)
53 {
54
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130 PetscFunctionBegin;
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130 PetscCheck(!rnorm,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"Not implemented yet");
56
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130 switch (mat) {
57 case DS_MAT_X:
58 break;
59 case DS_MAT_Y:
60 break;
61 ✗ default:
62 − SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Invalid mat parameter");
63 }
64
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26 PetscFunctionReturn(PETSC_SUCCESS);
65 }
66
67 3022 static PetscErrorCode DSSort_PEP(DS ds,PetscScalar *wr,PetscScalar *wi,PetscScalar *rr,PetscScalar *ri,PetscInt *kout)
68 {
69 3022 DS_PEP *ctx = (DS_PEP*)ds->data;
70 3022 PetscInt n,i,*perm,told;
71 3022 PetscScalar *A;
72
73
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3022 PetscFunctionBegin;
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3022 if (!ds->sc) PetscFunctionReturn(PETSC_SUCCESS);
75 3022 n = ds->n*ctx->d;
76 3022 perm = ds->perm;
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72966 for (i=0;i<n;i++) perm[i] = i;
78 3022 told = ds->t;
79 3022 ds->t = n; /* force the sorting routines to consider d*n eigenvalues */
80
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3022 if (rr) PetscCall(DSSortEigenvalues_Private(ds,rr,ri,perm,PETSC_FALSE));
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2972 else PetscCall(DSSortEigenvalues_Private(ds,wr,wi,perm,PETSC_FALSE));
82 3022 ds->t = told; /* restore value of t */
83
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
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72966 for (i=0;i<n;i++) A[i] = wr[perm[i]];
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72966 for (i=0;i<n;i++) wr[i] = A[i];
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72966 for (i=0;i<n;i++) A[i] = wi[perm[i]];
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72966 for (i=0;i<n;i++) wi[i] = A[i];
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
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3022 PetscCall(DSPermuteColumnsTwo_Private(ds,0,n,ds->n,DS_MAT_X,DS_MAT_Y,perm));
90
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618 PetscFunctionReturn(PETSC_SUCCESS);
91 }
92
93 3022 static PetscErrorCode DSSolve_PEP_QZ(DS ds,PetscScalar *wr,PetscScalar *wi)
94 {
95 3022 DS_PEP *ctx = (DS_PEP*)ds->data;
96 3022 PetscInt i,j,k,off;
97 3022 PetscScalar *A,*B,*W,*X,*U,*Y,*work,*beta,a;
98 3022 const PetscScalar *Ed,*Ei;
99 3022 PetscReal *ca,*cb,*cg,norm,done=1.0;
100 3022 PetscBLASInt n,ld,ldd,nd,lwork,one=1,zero=0,cols;
101 3022 PetscBool useggev3=(ds->method==1)?PETSC_TRUE:PETSC_FALSE;
102
103
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3022 PetscFunctionBegin;
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3022 PetscCall(PetscBLASIntCast(ds->n*ctx->d,&nd));
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3022 PetscCall(PetscBLASIntCast(ds->n,&n));
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3022 PetscCall(PetscBLASIntCast(ds->ld,&ld));
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3022 PetscCall(PetscBLASIntCast(ds->ld*ctx->d,&ldd));
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3022 PetscCall(DSAllocateMat_Private(ds,DS_MAT_A));
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3022 PetscCall(DSAllocateMat_Private(ds,DS_MAT_B));
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3022 PetscCall(DSAllocateMat_Private(ds,DS_MAT_W));
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3022 PetscCall(DSAllocateMat_Private(ds,DS_MAT_U));
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_B],&B));
114
115 /* build matrices A and B of the linearization */
116
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3022 PetscCall(MatDenseGetArrayRead(ds->omat[DSMatExtra[ctx->d]],&Ed));
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3022 PetscCall(PetscArrayzero(A,ldd*ldd));
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3022 if (!ctx->pbc) { /* monomial basis */
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31323 for (i=0;i<nd-ds->n;i++) A[i+(i+ds->n)*ldd] = 1.0;
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8069 for (i=0;i<ctx->d;i++) {
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5386 PetscCall(MatDenseGetArrayRead(ds->omat[DSMatExtra[i]],&Ei));
122 5386 off = i*ds->n*ldd+(ctx->d-1)*ds->n;
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62486 for (j=0;j<ds->n;j++) PetscCall(PetscArraycpy(A+off+j*ldd,Ei+j*ds->ld,ds->n));
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5386 PetscCall(MatDenseRestoreArrayRead(ds->omat[DSMatExtra[i]],&Ei));
125 }
126 } else {
127 339 ca = ctx->pbc;
128 339 cb = ca+ctx->d+1;
129 339 cg = cb+ctx->d+1;
130
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4847 for (i=0;i<ds->n;i++) {
131 4508 A[i+(i+ds->n)*ldd] = ca[0];
132 4508 A[i+i*ldd] = cb[0];
133 }
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4167 for (;i<nd-ds->n;i++) {
135 3828 j = i/ds->n;
136 3828 A[i+(i+ds->n)*ldd] = ca[j];
137 3828 A[i+i*ldd] = cb[j];
138 3828 A[i+(i-ds->n)*ldd] = cg[j];
139 }
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678 for (i=0;i<ctx->d-2;i++) {
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339 PetscCall(MatDenseGetArrayRead(ds->omat[DSMatExtra[i]],&Ei));
142 339 off = i*ds->n*ldd+(ctx->d-1)*ds->n;
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4167 for (j=0;j<ds->n;j++)
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89744 for (k=0;k<ds->n;k++)
145 85916 A[off+j*ldd+k] = Ei[j*ds->ld+k]*ca[ctx->d-1];
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339 PetscCall(MatDenseRestoreArrayRead(ds->omat[DSMatExtra[i]],&Ei));
147 }
148
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339 PetscCall(MatDenseGetArrayRead(ds->omat[DSMatExtra[i]],&Ei));
149 339 off = i*ds->n*ldd+(ctx->d-1)*ds->n;
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4847 for (j=0;j<ds->n;j++)
151
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170794 for (k=0;k<ds->n;k++)
152 166286 A[off+j*ldd+k] = Ei[j*ds->ld+k]*ca[ctx->d-1]-Ed[j*ds->ld+k]*cg[ctx->d-1];
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339 PetscCall(MatDenseRestoreArrayRead(ds->omat[DSMatExtra[i]],&Ei));
154 339 i++;
155
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339 PetscCall(MatDenseGetArrayRead(ds->omat[DSMatExtra[i]],&Ei));
156 339 off = i*ds->n*ldd+(ctx->d-1)*ds->n;
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4847 for (j=0;j<ds->n;j++)
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170794 for (k=0;k<ds->n;k++)
159 166286 A[off+j*ldd+k] = Ei[j*ds->ld+k]*ca[ctx->d-1]-Ed[j*ds->ld+k]*cb[ctx->d-1];
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339 PetscCall(MatDenseRestoreArrayRead(ds->omat[DSMatExtra[i]],&Ei));
161 }
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3022 PetscCall(PetscArrayzero(B,ldd*ldd));
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39998 for (i=0;i<nd-ds->n;i++) B[i+i*ldd] = 1.0;
164 3022 off = (ctx->d-1)*ds->n*(ldd+1);
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35990 for (j=0;j<ds->n;j++) {
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580012 for (i=0;i<ds->n;i++) B[off+i+j*ldd] = -Ed[i+j*ds->ld];
167 }
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3022 PetscCall(MatDenseRestoreArrayRead(ds->omat[DSMatExtra[ctx->d]],&Ed));
169
170 /* solve generalized eigenproblem */
171
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_W],&W));
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_U],&U));
173 3022 lwork = -1;
174 #if PetscDefined(USE_COMPLEX)
175
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1558 if (useggev3) PetscCallLAPACKInfo("LAPACKggev3",LAPACKggev3_("V","V",&nd,A,&ldd,B,&ldd,wr,NULL,U,&ldd,W,&ldd,&a,&lwork,NULL,&info));
176
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1558 else PetscCallLAPACKInfo("LAPACKggev",LAPACKggev_("V","V",&nd,A,&ldd,B,&ldd,wr,NULL,U,&ldd,W,&ldd,&a,&lwork,NULL,&info));
177
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1558 PetscCall(PetscBLASIntCast((PetscInt)PetscRealPart(a),&lwork));
178
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1558 PetscCall(DSAllocateWork_Private(ds,lwork+nd,8*nd,0));
179 1558 beta = ds->work;
180 1558 work = ds->work + nd;
181
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1558 if (useggev3) PetscCallLAPACKInfo("LAPACKggev3",LAPACKggev3_("V","V",&nd,A,&ldd,B,&ldd,wr,beta,U,&ldd,W,&ldd,work,&lwork,ds->rwork,&info));
182
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1558 else PetscCallLAPACKInfo("LAPACKggev",LAPACKggev_("V","V",&nd,A,&ldd,B,&ldd,wr,beta,U,&ldd,W,&ldd,work,&lwork,ds->rwork,&info));
183 #else
184
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1464 if (useggev3) PetscCallLAPACKInfo("LAPACKggev3",LAPACKggev3_("V","V",&nd,A,&ldd,B,&ldd,wr,wi,NULL,U,&ldd,W,&ldd,&a,&lwork,&info));
185
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1464 else PetscCallLAPACKInfo("LAPACKggev",LAPACKggev_("V","V",&nd,A,&ldd,B,&ldd,wr,wi,NULL,U,&ldd,W,&ldd,&a,&lwork,&info));
186
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1464 PetscCall(PetscBLASIntCast((PetscInt)a,&lwork));
187
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1464 PetscCall(DSAllocateWork_Private(ds,lwork+nd,0,0));
188 1464 beta = ds->work;
189 1464 work = ds->work + nd;
190
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1464 if (useggev3) PetscCallLAPACKInfo("LAPACKggev3",LAPACKggev3_("V","V",&nd,A,&ldd,B,&ldd,wr,wi,beta,U,&ldd,W,&ldd,work,&lwork,&info));
191
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1464 else PetscCallLAPACKInfo("LAPACKggev",LAPACKggev_("V","V",&nd,A,&ldd,B,&ldd,wr,wi,beta,U,&ldd,W,&ldd,work,&lwork,&info));
192 #endif
193
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
194
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_B],&B));
195
196 /* copy eigenvalues */
197
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72966 for (i=0;i<nd;i++) {
198
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69944 if (beta[i]==0.0) wr[i] = (PetscRealPart(wr[i])>0.0)? PETSC_MAX_REAL: PETSC_MIN_REAL;
199 69942 else wr[i] /= beta[i];
200 #if !PetscDefined(USE_COMPLEX)
201
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32020 if (beta[i]==0.0) wi[i] = 0.0;
202 32020 else wi[i] /= beta[i];
203 #else
204
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37924 if (wi) wi[i] = 0.0;
205 #endif
206 }
207
208 /* copy and normalize eigenvectors */
209
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_X],&X));
210
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3022 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Y],&Y));
211
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72966 for (j=0;j<nd;j++) {
212
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69944 PetscCall(PetscArraycpy(X+j*ds->ld,W+j*ldd,ds->n));
213
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69944 PetscCall(PetscArraycpy(Y+j*ds->ld,U+ds->n*(ctx->d-1)+j*ldd,ds->n));
214 }
215
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_W],&W));
216
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_U],&U));
217
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70087 for (j=0;j<nd;j++) {
218 67065 cols = 1;
219 67065 norm = BLASnrm2_(&n,X+j*ds->ld,&one);
220 #if !PetscDefined(USE_COMPLEX)
221
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29141 if (wi[j] != 0.0) {
222 2879 norm = SlepcAbsEigenvalue(norm,BLASnrm2_(&n,X+(j+1)*ds->ld,&one));
223 2879 cols = 2;
224 }
225 #endif
226
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67065 PetscCallLAPACKInfo("LAPACKlascl",LAPACKlascl_("G",&zero,&zero,&norm,&done,&n,&cols,X+j*ds->ld,&ld,&info));
227 67065 norm = BLASnrm2_(&n,Y+j*ds->ld,&one);
228 #if !PetscDefined(USE_COMPLEX)
229
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29141 if (wi[j] != 0.0) norm = SlepcAbsEigenvalue(norm,BLASnrm2_(&n,Y+(j+1)*ds->ld,&one));
230 #endif
231
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67065 PetscCallLAPACKInfo("LAPACKlascl",LAPACKlascl_("G",&zero,&zero,&norm,&done,&n,&cols,Y+j*ds->ld,&ld,&info));
232 #if !PetscDefined(USE_COMPLEX)
233
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29141 if (wi[j] != 0.0) j++;
234 #endif
235 }
236
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_X],&X));
237
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3022 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Y],&Y));
238
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618 PetscFunctionReturn(PETSC_SUCCESS);
239 }
240
241 #if !PetscDefined(HAVE_MPIUNI)
242 550 static PetscErrorCode DSSynchronize_PEP(DS ds,PetscScalar eigr[],PetscScalar eigi[])
243 {
244 550 DS_PEP *ctx = (DS_PEP*)ds->data;
245 550 PetscInt ld=ds->ld,k=0;
246 550 PetscMPIInt ldnd,rank,off=0,size,dn;
247 550 PetscScalar *X,*Y;
248
249
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550 PetscFunctionBegin;
250
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550 if (ds->state>=DS_STATE_CONDENSED) k += 2*ctx->d*ds->n*ld;
251
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550 if (eigr) k += ctx->d*ds->n;
252
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550 if (eigi) k += ctx->d*ds->n;
253
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550 PetscCall(DSAllocateWork_Private(ds,k,0,0));
254
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550 PetscCall(PetscMPIIntCast(k*sizeof(PetscScalar),&size));
255
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550 PetscCall(PetscMPIIntCast(ds->n*ctx->d*ld,&ldnd));
256
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550 PetscCall(PetscMPIIntCast(ctx->d*ds->n,&dn));
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550 if (ds->state>=DS_STATE_CONDENSED) {
258
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550 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_X],&X));
259
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550 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Y],&Y));
260 }
261
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550 PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)ds),&rank));
262
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550 if (!rank) {
263
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275 if (ds->state>=DS_STATE_CONDENSED) {
264
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275 PetscCallMPI(MPI_Pack(X,ldnd,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
265
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275 PetscCallMPI(MPI_Pack(Y,ldnd,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
266 }
267
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275 if (eigr) PetscCallMPI(MPI_Pack(eigr,dn,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
268 #if !PetscDefined(USE_COMPLEX)
269
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145 if (eigi) PetscCallMPI(MPI_Pack(eigi,dn,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
270 #endif
271 }
272
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1100 PetscCallMPI(MPI_Bcast(ds->work,size,MPI_BYTE,0,PetscObjectComm((PetscObject)ds)));
273
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550 if (rank) {
274
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275 if (ds->state>=DS_STATE_CONDENSED) {
275
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275 PetscCallMPI(MPI_Unpack(ds->work,size,&off,X,ldnd,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
276
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275 PetscCallMPI(MPI_Unpack(ds->work,size,&off,Y,ldnd,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
277 }
278
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275 if (eigr) PetscCallMPI(MPI_Unpack(ds->work,size,&off,eigr,dn,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
279 #if !PetscDefined(USE_COMPLEX)
280
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145 if (eigi) PetscCallMPI(MPI_Unpack(ds->work,size,&off,eigi,dn,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
281 #endif
282 }
283
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550 if (ds->state>=DS_STATE_CONDENSED) {
284
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550 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_X],&X));
285
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550 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Y],&Y));
286 }
287
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110 PetscFunctionReturn(PETSC_SUCCESS);
288 }
289 #endif
290
291 195 static PetscErrorCode DSPEPSetDegree_PEP(DS ds,PetscInt d)
292 {
293 195 DS_PEP *ctx = (DS_PEP*)ds->data;
294
295
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195 PetscFunctionBegin;
296
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195 PetscCheck(d>=0,PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"The degree must be a non-negative integer");
297
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195 PetscCheck(d<DS_NUM_EXTRA,PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Only implemented for polynomials of degree at most %d",DS_NUM_EXTRA-1);
298 195 ctx->d = d;
299
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195 PetscFunctionReturn(PETSC_SUCCESS);
300 }
301
302 /*@
303 DSPEPSetDegree - Sets the polynomial degree for a `DSPEP`.
304
305 Logically Collective
306
307 Input Parameters:
308 + ds - the direct solver context
309 - d - the degree
310
311 Level: intermediate
312
313 .seealso: [](sec:ds), `DSPEP`, `DSPEPGetDegree()`
314 @*/
315 195 PetscErrorCode DSPEPSetDegree(DS ds,PetscInt d)
316 {
317
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195 PetscFunctionBegin;
318
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195 PetscValidHeaderSpecific(ds,DS_CLASSID,1);
319
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195 PetscValidLogicalCollectiveInt(ds,d,2);
320
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195 PetscTryMethod(ds,"DSPEPSetDegree_C",(DS,PetscInt),(ds,d));
321
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195 PetscFunctionReturn(PETSC_SUCCESS);
322 }
323
324 12468 static PetscErrorCode DSPEPGetDegree_PEP(DS ds,PetscInt *d)
325 {
326 12468 DS_PEP *ctx = (DS_PEP*)ds->data;
327
328
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12468 PetscFunctionBegin;
329 12468 *d = ctx->d;
330
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12468 PetscFunctionReturn(PETSC_SUCCESS);
331 }
332
333 /*@
334 DSPEPGetDegree - Returns the polynomial degree for a `DSPEP`.
335
336 Not Collective
337
338 Input Parameter:
339 . ds - the direct solver context
340
341 Output Parameter:
342 . d - the degree
343
344 Level: intermediate
345
346 .seealso: [](sec:ds), `DSPEP`, `DSPEPSetDegree()`
347 @*/
348 12468 PetscErrorCode DSPEPGetDegree(DS ds,PetscInt *d)
349 {
350
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12468 PetscFunctionBegin;
351
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12468 PetscValidHeaderSpecific(ds,DS_CLASSID,1);
352
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12468 PetscAssertPointer(d,2);
353
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12468 PetscUseMethod(ds,"DSPEPGetDegree_C",(DS,PetscInt*),(ds,d));
354
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12468 PetscFunctionReturn(PETSC_SUCCESS);
355 }
356
357 70 static PetscErrorCode DSPEPSetCoefficients_PEP(DS ds,PetscReal *pbc)
358 {
359 70 DS_PEP *ctx = (DS_PEP*)ds->data;
360 70 PetscInt i;
361
362
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70 PetscFunctionBegin;
363
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70 PetscCheck(ctx->d,PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_WRONGSTATE,"Must first specify the polynomial degree via DSPEPSetDegree()");
364
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70 PetscCall(PetscFree(ctx->pbc));
365
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70 PetscCall(PetscMalloc1(3*(ctx->d+1),&ctx->pbc));
366
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910 for (i=0;i<3*(ctx->d+1);i++) ctx->pbc[i] = pbc[i];
367 70 ds->state = DS_STATE_RAW;
368
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70 PetscFunctionReturn(PETSC_SUCCESS);
369 }
370
371 /*@
372 DSPEPSetCoefficients - Sets the polynomial basis coefficients for a `DSPEP`.
373
374 Logically Collective
375
376 Input Parameters:
377 + ds - the direct solver context
378 - pbc - the polynomial basis coefficients
379
380 Notes:
381 This function is required only in the case of a polynomial specified in a
382 non-monomial basis, to provide the coefficients that will be used
383 during the linearization, multiplying the identity blocks on the three main
384 diagonal blocks. Depending on the polynomial basis (Chebyshev, Legendre, ...)
385 the coefficients must be different.
386
387 There must be a total of $3(d+1)$ coefficients, where $d$ is the degree of the
388 polynomial. The coefficients are arranged in three groups, $\alpha_i$, $\beta_i$, and
389 $\gamma_i$, according to the definition of the three-term recurrence. In the case
390 of the monomial basis, $\alpha_i=1$ and $\beta_i=\gamma_i=0$, in which case it is not
391 necessary to invoke this function.
392
393 Level: advanced
394
395 .seealso: [](sec:ds), `DSPEP`, `DSPEPGetCoefficients()`, `DSPEPSetDegree()`
396 @*/
397 70 PetscErrorCode DSPEPSetCoefficients(DS ds,PetscReal pbc[])
398 {
399
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70 PetscFunctionBegin;
400
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70 PetscValidHeaderSpecific(ds,DS_CLASSID,1);
401
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70 PetscAssertPointer(pbc,2);
402
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70 PetscTryMethod(ds,"DSPEPSetCoefficients_C",(DS,PetscReal*),(ds,pbc));
403
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70 PetscFunctionReturn(PETSC_SUCCESS);
404 }
405
406 10 static PetscErrorCode DSPEPGetCoefficients_PEP(DS ds,PetscReal *pbc[])
407 {
408 10 DS_PEP *ctx = (DS_PEP*)ds->data;
409 10 PetscInt i;
410
411
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10 PetscFunctionBegin;
412
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10 PetscCheck(ctx->d,PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_WRONGSTATE,"Must first specify the polynomial degree via DSPEPSetDegree()");
413
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10 PetscCall(PetscCalloc1(3*(ctx->d+1),pbc));
414
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10 if (ctx->pbc) for (i=0;i<3*(ctx->d+1);i++) (*pbc)[i] = ctx->pbc[i];
415
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40 else for (i=0;i<ctx->d+1;i++) (*pbc)[i] = 1.0;
416
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2 PetscFunctionReturn(PETSC_SUCCESS);
417 }
418
419 /*@
420 DSPEPGetCoefficients - Returns the polynomial basis coefficients for a `DSPEP`.
421
422 Not Collective
423
424 Input Parameter:
425 . ds - the direct solver context
426
427 Output Parameter:
428 . pbc - the polynomial basis coefficients
429
430 Note:
431 The returned array has length $3(d+1)$, where $d$ is the degree of the
432 polynomial, and should be freed by the user.
433
434 Fortran Notes:
435 In Fortran the user must provide in argument `pbc` a sufficiently large array.
436
437 Level: advanced
438
439 .seealso: [](sec:ds), `DSPEP`, `DSPEPSetCoefficients()`
440 @*/
441 10 PetscErrorCode DSPEPGetCoefficients(DS ds,PetscReal *pbc[]) PeNS
442 {
443
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10 PetscFunctionBegin;
444
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10 PetscValidHeaderSpecific(ds,DS_CLASSID,1);
445
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10 PetscAssertPointer(pbc,2);
446
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10 PetscUseMethod(ds,"DSPEPGetCoefficients_C",(DS,PetscReal**),(ds,pbc));
447
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10 PetscFunctionReturn(PETSC_SUCCESS);
448 }
449
450 185 static PetscErrorCode DSDestroy_PEP(DS ds)
451 {
452 185 DS_PEP *ctx = (DS_PEP*)ds->data;
453
454
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185 PetscFunctionBegin;
455
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185 PetscCall(PetscFree(ctx->pbc));
456
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185 PetscCall(PetscFree(ds->data));
457
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPSetDegree_C",NULL));
458
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPGetDegree_C",NULL));
459
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPSetCoefficients_C",NULL));
460
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPGetCoefficients_C",NULL));
461
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37 PetscFunctionReturn(PETSC_SUCCESS);
462 }
463
464 9742 static PetscErrorCode DSMatGetSize_PEP(DS ds,DSMatType t,PetscInt *rows,PetscInt *cols)
465 {
466 9742 DS_PEP *ctx = (DS_PEP*)ds->data;
467
468
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9742 PetscFunctionBegin;
469
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9742 PetscCheck(ctx->d,PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_WRONGSTATE,"DSPEP requires specifying the polynomial degree via DSPEPSetDegree()");
470 9742 *rows = ds->n;
471
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9742 if (t==DS_MAT_A || t==DS_MAT_B || t==DS_MAT_W || t==DS_MAT_U) *rows *= ctx->d;
472 9742 *cols = ds->n;
473
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9742 if (t==DS_MAT_A || t==DS_MAT_B || t==DS_MAT_W || t==DS_MAT_U || t==DS_MAT_X || t==DS_MAT_Y) *cols *= ctx->d;
474
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1993 PetscFunctionReturn(PETSC_SUCCESS);
475 }
476
477 /*MC
478 DSPEP - Dense Polynomial Eigenvalue Problem.
479
480 Notes:
481 The problem is expressed as $P(\lambda)x = 0$, where $P(\cdot)$ is a
482 polynomial matrix of degree $d$. The eigenvalues $\lambda$ are the arguments
483 returned by `DSSolve()`.
484
485 The degree of the polynomial, $d$, can be set with `DSPEPSetDegree()`, with
486 the first $d+1$ extra matrices of the `DS` storing the polynomial coefficient.
487 By default, the polynomial is expressed in the monomial basis, but a
488 different basis can be used by setting the corresponding coefficients
489 via `DSPEPSetCoefficients()`.
490
491 The problem is solved via linearization, by building a pencil $(A,B)$ of
492 size $d\cdot n$ and solving the corresponding `GNHEP`.
493
494 Used DS matrices:
495 + `DS_MAT_E0` to `DS_MAT_E9` - coefficients of the matrix polynomial
496 . `DS_MAT_X` - right eigenvectors
497 . `DS_MAT_Y` - left eigenvectors
498 . `DS_MAT_A` - (workspace) first matrix of the linearization
499 . `DS_MAT_B` - (workspace) second matrix of the linearization
500 . `DS_MAT_W` - (workspace) right eigenvectors of the linearization
501 - `DS_MAT_U` - (workspace) left eigenvectors of the linearization
502
503 Implemented methods:
504 . 0 - QZ iteration on the linearization (`_ggev`)
505
506 Level: beginner
507
508 .seealso: [](sec:ds), `DSCreate()`, `DSSetType()`, `DSType`, `DSPEPSetDegree()`, `DSPEPSetCoefficients()`
509 M*/
510 185 SLEPC_EXTERN PetscErrorCode DSCreate_PEP(DS ds)
511 {
512 185 DS_PEP *ctx;
513
514
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185 PetscFunctionBegin;
515
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185 PetscCall(PetscNew(&ctx));
516 185 ds->data = (void*)ctx;
517
518 185 ds->ops->allocate = DSAllocate_PEP;
519 185 ds->ops->view = DSView_PEP;
520 185 ds->ops->vectors = DSVectors_PEP;
521 185 ds->ops->solve[0] = DSSolve_PEP_QZ;
522 #if !defined(SLEPC_MISSING_LAPACK_GGES3)
523 185 ds->ops->solve[1] = DSSolve_PEP_QZ;
524 #endif
525 185 ds->ops->sort = DSSort_PEP;
526 #if !PetscDefined(HAVE_MPIUNI)
527 185 ds->ops->synchronize = DSSynchronize_PEP;
528 #endif
529 185 ds->ops->destroy = DSDestroy_PEP;
530 185 ds->ops->matgetsize = DSMatGetSize_PEP;
531
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPSetDegree_C",DSPEPSetDegree_PEP));
532
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPGetDegree_C",DSPEPGetDegree_PEP));
533
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPSetCoefficients_C",DSPEPSetCoefficients_PEP));
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185 PetscCall(PetscObjectComposeFunction((PetscObject)ds,"DSPEPGetCoefficients_C",DSPEPGetCoefficients_PEP));
535
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37 PetscFunctionReturn(PETSC_SUCCESS);
536 }
537