GCC Code Coverage Report


Directory: ./
File: src/sys/classes/ds/impls/hep/dshep.c
Date: 2025-10-04 04:19:13
Exec Total Coverage
Lines: 526 556 94.6%
Functions: 20 20 100.0%
Branches: 1350 2413 55.9%

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>
12 #include <slepcblaslapack.h>
13
14 3528 static PetscErrorCode DSAllocate_HEP(DS ds,PetscInt ld)
15 {
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3528 PetscFunctionBegin;
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3528 if (!ds->compact) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A));
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3528 PetscCall(DSAllocateMat_Private(ds,DS_MAT_Q));
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3528 PetscCall(DSAllocateMat_Private(ds,DS_MAT_T));
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3528 PetscCall(PetscFree(ds->perm));
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3528 PetscCall(PetscMalloc1(ld,&ds->perm));
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670 PetscFunctionReturn(PETSC_SUCCESS);
23 }
24
25 /* 0 l k n-1
26 -----------------------------------------
27 |* . . |
28 | * . . |
29 | * . . |
30 | * . . |
31 |. . . . o o |
32 | o o |
33 | o o |
34 | o o |
35 | o o |
36 | o o |
37 |. . . . o o o o o o o x |
38 | x x x |
39 | x x x |
40 | x x x |
41 | x x x |
42 | x x x |
43 | x x x |
44 | x x x |
45 | x x x|
46 | x x|
47 -----------------------------------------
48 */
49
50 1326 static PetscErrorCode DSSwitchFormat_HEP(DS ds)
51 {
52 1326 PetscReal *T;
53 1326 PetscScalar *A;
54 1326 PetscInt i,n=ds->n,k=ds->k,ld=ds->ld;
55
56
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1326 PetscFunctionBegin;
57 /* switch from compact (arrow) to dense storage */
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1326 PetscCall(MatDenseGetArrayWrite(ds->omat[DS_MAT_A],&A));
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1326 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T));
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1326 PetscCall(PetscArrayzero(A,ld*ld));
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1326 for (i=0;i<k;i++) {
62 A[i+i*ld] = T[i];
63 A[k+i*ld] = T[i+ld];
64 A[i+k*ld] = T[i+ld];
65 }
66 1326 A[k+k*ld] = T[k];
67
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23388 for (i=k+1;i<n;i++) {
68 22062 A[i+i*ld] = T[i];
69 22062 A[i-1+i*ld] = T[i-1+ld];
70 22062 A[i+(i-1)*ld] = T[i-1+ld];
71 }
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1326 if (ds->extrarow) A[n+(n-1)*ld] = T[n-1+ld];
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1326 PetscCall(MatDenseRestoreArrayWrite(ds->omat[DS_MAT_A],&A));
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1326 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T));
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236 PetscFunctionReturn(PETSC_SUCCESS);
76 }
77
78 208 static PetscErrorCode DSView_HEP(DS ds,PetscViewer viewer)
79 {
80 208 PetscViewerFormat format;
81 208 PetscInt i,j,r,c,rows;
82 208 PetscReal *T,value;
83 208 const char *methodname[] = {
84 "Implicit QR method (_steqr)",
85 "Relatively Robust Representations (_stevr)",
86 "Divide and Conquer method (_stedc)",
87 "Block Divide and Conquer method (dsbtdc)"
88 };
89 208 const int nmeth=PETSC_STATIC_ARRAY_LENGTH(methodname);
90
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208 PetscFunctionBegin;
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208 PetscCall(PetscViewerGetFormat(viewer,&format));
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208 if (format == PETSC_VIEWER_ASCII_INFO || format == PETSC_VIEWER_ASCII_INFO_DETAIL) {
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148 if (ds->bs>1) PetscCall(PetscViewerASCIIPrintf(viewer,"block size: %" PetscInt_FMT "\n",ds->bs));
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148 if (ds->method<nmeth) PetscCall(PetscViewerASCIIPrintf(viewer,"solving the problem with: %s\n",methodname[ds->method]));
96
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148 PetscFunctionReturn(PETSC_SUCCESS);
97 }
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60 if (ds->compact) {
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60 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T));
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60 PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_FALSE));
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60 rows = ds->extrarow? ds->n+1: ds->n;
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60 if (format == PETSC_VIEWER_ASCII_MATLAB) {
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60 PetscCall(PetscViewerASCIIPrintf(viewer,"%% Size = %" PetscInt_FMT " %" PetscInt_FMT "\n",rows,ds->n));
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60 PetscCall(PetscViewerASCIIPrintf(viewer,"zzz = zeros(%" PetscInt_FMT ",3);\n",3*ds->n));
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60 PetscCall(PetscViewerASCIIPrintf(viewer,"zzz = [\n"));
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600 for (i=0;i<ds->n;i++) PetscCall(PetscViewerASCIIPrintf(viewer,"%" PetscInt_FMT " %" PetscInt_FMT " %18.16e\n",i+1,i+1,(double)T[i]));
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570 for (i=0;i<rows-1;i++) {
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510 r = PetscMax(i+2,ds->k+1);
109 510 c = i+1;
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510 PetscCall(PetscViewerASCIIPrintf(viewer,"%" PetscInt_FMT " %" PetscInt_FMT " %18.16e\n",r,c,(double)T[i+ds->ld]));
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510 if (i<ds->n-1 && ds->k<ds->n) { /* do not print vertical arrow when k=n */
112
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480 PetscCall(PetscViewerASCIIPrintf(viewer,"%" PetscInt_FMT " %" PetscInt_FMT " %18.16e\n",c,r,(double)T[i+ds->ld]));
113 }
114 }
115
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60 PetscCall(PetscViewerASCIIPrintf(viewer,"];\n%s = spconvert(zzz);\n",DSMatName[DS_MAT_T]));
116 } else {
117 for (i=0;i<rows;i++) {
118 for (j=0;j<ds->n;j++) {
119 if (i==j) value = T[i];
120 else if ((i<ds->k && j==ds->k) || (i==ds->k && j<ds->k)) value = T[PetscMin(i,j)+ds->ld];
121 else if (i==j+1 && i>ds->k) value = T[i-1+ds->ld];
122 else if (i+1==j && j>ds->k) value = T[j-1+ds->ld];
123 else value = 0.0;
124 PetscCall(PetscViewerASCIIPrintf(viewer," %18.16e ",(double)value));
125 }
126 PetscCall(PetscViewerASCIIPrintf(viewer,"\n"));
127 }
128 }
129
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60 PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_TRUE));
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60 PetscCall(PetscViewerFlush(viewer));
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60 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T));
132 } else PetscCall(DSViewMat(ds,viewer,DS_MAT_A));
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60 if (ds->state>DS_STATE_INTERMEDIATE) PetscCall(DSViewMat(ds,viewer,DS_MAT_Q));
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12 PetscFunctionReturn(PETSC_SUCCESS);
135 }
136
137 242399 static PetscErrorCode DSVectors_HEP(DS ds,DSMatType mat,PetscInt *j,PetscReal *rnorm)
138 {
139 242399 PetscScalar *Z;
140 242399 const PetscScalar *Q;
141 242399 PetscInt ld = ds->ld;
142
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242399 PetscFunctionBegin;
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242399 switch (mat) {
145 242399 case DS_MAT_X:
146 case DS_MAT_Y:
147
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242399 if (j) {
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241787 PetscCall(MatDenseGetArray(ds->omat[mat],&Z));
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241787 if (ds->state>=DS_STATE_CONDENSED) {
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241787 PetscCall(MatDenseGetArrayRead(ds->omat[DS_MAT_Q],&Q));
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241787 PetscCall(PetscArraycpy(Z+(*j)*ld,Q+(*j)*ld,ld));
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241787 if (rnorm) *rnorm = PetscAbsScalar(Q[ds->n-1+(*j)*ld]);
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241787 PetscCall(MatDenseRestoreArrayRead(ds->omat[DS_MAT_Q],&Q));
154 } else {
155 PetscCall(PetscArrayzero(Z+(*j)*ld,ld));
156 Z[(*j)+(*j)*ld] = 1.0;
157 if (rnorm) *rnorm = 0.0;
158 }
159
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241787 PetscCall(MatDenseRestoreArray(ds->omat[mat],&Z));
160 } else {
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612 if (ds->state>=DS_STATE_CONDENSED) PetscCall(MatCopy(ds->omat[DS_MAT_Q],ds->omat[mat],SAME_NONZERO_PATTERN));
162 else PetscCall(DSSetIdentity(ds,mat));
163 }
164 46901 break;
165 case DS_MAT_U:
166 case DS_MAT_V:
167 SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"Not implemented yet");
168 default:
169 SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Invalid mat parameter");
170 }
171
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46901 PetscFunctionReturn(PETSC_SUCCESS);
172 }
173
174 /*
175 ARROWTRIDIAG reduces a symmetric arrowhead matrix of the form
176
177 [ d 0 0 0 e ]
178 [ 0 d 0 0 e ]
179 A = [ 0 0 d 0 e ]
180 [ 0 0 0 d e ]
181 [ e e e e d ]
182
183 to tridiagonal form
184
185 [ d e 0 0 0 ]
186 [ e d e 0 0 ]
187 T = Q'*A*Q = [ 0 e d e 0 ],
188 [ 0 0 e d e ]
189 [ 0 0 0 e d ]
190
191 where Q is an orthogonal matrix. Rutishauser's algorithm is used to
192 perform the reduction, which requires O(n**2) flops. The accumulation
193 of the orthogonal factor Q, however, requires O(n**3) flops.
194
195 Arguments
196 =========
197
198 N (input) INTEGER
199 The order of the matrix A. N >= 0.
200
201 D (input/output) DOUBLE PRECISION array, dimension (N)
202 On entry, the diagonal entries of the matrix A to be
203 reduced.
204 On exit, the diagonal entries of the reduced matrix T.
205
206 E (input/output) DOUBLE PRECISION array, dimension (N-1)
207 On entry, the off-diagonal entries of the matrix A to be
208 reduced.
209 On exit, the subdiagonal entries of the reduced matrix T.
210
211 Q (input/output) DOUBLE PRECISION array, dimension (LDQ, N)
212 On exit, the orthogonal matrix Q.
213
214 LDQ (input) INTEGER
215 The leading dimension of the array Q.
216
217 Note
218 ====
219 Based on Fortran code contributed by Daniel Kressner
220 */
221 25080 PetscErrorCode DSArrowTridiag(PetscBLASInt n,PetscReal *d,PetscReal *e,PetscScalar *Q,PetscBLASInt ld)
222 {
223 25080 PetscBLASInt i,j,j2,one=1;
224 25080 PetscReal c,s,p,off,temp;
225
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25080 PetscFunctionBegin;
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25080 if (n<=2) PetscFunctionReturn(PETSC_SUCCESS);
228
229
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196591 for (j=0;j<n-2;j++) {
230
231 /* Eliminate entry e(j) by a rotation in the planes (j,j+1) */
232 171640 temp = e[j+1];
233
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171640 PetscCallBLAS("LAPACKlartg",LAPACKREALlartg_(&temp,&e[j],&c,&s,&e[j+1]));
234 171640 s = -s;
235
236 /* Apply rotation to diagonal elements */
237 171640 temp = d[j+1];
238 171640 e[j] = c*s*(temp-d[j]);
239 171640 d[j+1] = s*s*d[j] + c*c*temp;
240 171640 d[j] = c*c*d[j] + s*s*temp;
241
242 /* Apply rotation to Q */
243 171640 j2 = j+2;
244
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171640 PetscCallBLAS("BLASrot",BLASMIXEDrot_(&j2,Q+j*ld,&one,Q+(j+1)*ld,&one,&c,&s));
245
246 /* Chase newly introduced off-diagonal entry to the top left corner */
247
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1074978 for (i=j-1;i>=0;i--) {
248 903338 off = -s*e[i];
249 903338 e[i] = c*e[i];
250 903338 temp = e[i+1];
251
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903338 PetscCallBLAS("LAPACKlartg",LAPACKREALlartg_(&temp,&off,&c,&s,&e[i+1]));
252 903338 s = -s;
253 903338 temp = (d[i]-d[i+1])*s - 2.0*c*e[i];
254 903338 p = s*temp;
255 903338 d[i+1] += p;
256 903338 d[i] -= p;
257 903338 e[i] = -e[i] - c*temp;
258
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903338 PetscCallBLAS("BLASrot",BLASMIXEDrot_(&j2,Q+i*ld,&one,Q+(i+1)*ld,&one,&c,&s));
259 }
260 }
261
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4875 PetscFunctionReturn(PETSC_SUCCESS);
262 }
263
264 /*
265 Reduce to tridiagonal form by means of DSArrowTridiag.
266 */
267 105845 static PetscErrorCode DSIntermediate_HEP(DS ds)
268 {
269 105845 PetscInt i;
270 105845 PetscBLASInt n1 = 0,n2,lwork,info,l = 0,n = 0,ld,off;
271 105845 PetscScalar *Q,*work,*tau;
272 105845 const PetscScalar *A;
273 105845 PetscReal *d,*e;
274 105845 Mat At,Qt; /* trailing submatrices */
275
276
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105845 PetscFunctionBegin;
277
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105845 PetscCall(PetscBLASIntCast(ds->n,&n));
278
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105845 PetscCall(PetscBLASIntCast(ds->l,&l));
279
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105845 PetscCall(PetscBLASIntCast(ds->ld,&ld));
280
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105845 PetscCall(PetscBLASIntCast(PetscMax(0,ds->k-l+1),&n1)); /* size of leading block, excl. locked */
281 105845 n2 = n-l; /* n2 = n1 + size of trailing block */
282 105845 off = l+l*ld;
283
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105845 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d));
284 105845 e = d+ld;
285
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105845 PetscCall(DSSetIdentity(ds,DS_MAT_Q));
286
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105845 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q));
287
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105845 if (ds->compact) {
289
290
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34633 if (ds->state<DS_STATE_INTERMEDIATE) PetscCall(DSArrowTridiag(n1,d+l,e+l,Q+off,ld));
291
292 } else {
293
294
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71212 PetscCall(MatDenseGetArrayRead(ds->omat[DS_MAT_A],&A));
295
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73173 for (i=0;i<l;i++) { d[i] = PetscRealPart(A[i+i*ld]); e[i] = 0.0; }
296
297
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71212 if (ds->state<DS_STATE_INTERMEDIATE) {
298
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71212 PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_A],ds->l,ds->n,ds->l,ds->n,&At));
299
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71212 PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_Q],ds->l,ds->n,ds->l,ds->n,&Qt));
300
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71212 PetscCall(MatCopy(At,Qt,SAME_NONZERO_PATTERN));
301
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71212 PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_A],&At));
302
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71212 PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_Q],&Qt));
303
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71212 PetscCall(DSAllocateWork_Private(ds,ld+ld*ld,0,0));
304 71212 tau = ds->work;
305 71212 work = ds->work+ld;
306 71212 lwork = ld*ld;
307
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71212 PetscCallBLAS("LAPACKsytrd",LAPACKsytrd_("L",&n2,Q+off,&ld,d+l,e+l,tau,work,&lwork,&info));
308
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71212 SlepcCheckLapackInfo("sytrd",info);
309
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71212 PetscCallBLAS("LAPACKorgtr",LAPACKorgtr_("L",&n2,Q+off,&ld,tau,work,&lwork,&info));
310
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71212 SlepcCheckLapackInfo("orgtr",info);
311 } else {
312 /* copy tridiagonal to d,e */
313 for (i=l;i<n;i++) d[i] = PetscRealPart(A[i+i*ld]);
314 for (i=l;i<n-1;i++) e[i] = PetscRealPart(A[(i+1)+i*ld]);
315 }
316
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71212 PetscCall(MatDenseRestoreArrayRead(ds->omat[DS_MAT_A],&A));
317 }
318
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105845 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q));
319
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105845 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d));
320
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20431 PetscFunctionReturn(PETSC_SUCCESS);
321 }
322
323 173014 static PetscErrorCode DSSort_HEP(DS ds,PetscScalar *wr,PetscScalar *wi,PetscScalar *rr,PetscScalar *ri,PetscInt *k)
324 {
325 173014 PetscInt n,l,i,*perm,ld=ds->ld;
326 173014 PetscScalar *A;
327 173014 PetscReal *d;
328
329
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173014 PetscFunctionBegin;
330
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173014 if (!ds->sc) PetscFunctionReturn(PETSC_SUCCESS);
331 173014 n = ds->n;
332 173014 l = ds->l;
333
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173014 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d));
334 173014 perm = ds->perm;
335
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173014 if (!rr) PetscCall(DSSortEigenvaluesReal_Private(ds,d,perm));
336
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136006 else PetscCall(DSSortEigenvalues_Private(ds,rr,ri,perm,PETSC_FALSE));
337
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2296206 for (i=l;i<n;i++) wr[i] = d[perm[i]];
338
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173014 PetscCall(DSPermuteColumns_Private(ds,l,n,n,DS_MAT_Q,perm));
339
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2296206 for (i=l;i<n;i++) d[i] = PetscRealPart(wr[i]);
340
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173014 if (!ds->compact) {
341
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138381 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
342
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1718866 for (i=l;i<n;i++) A[i+i*ld] = wr[i];
343
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138381 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
344 }
345
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173014 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d));
346
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33341 PetscFunctionReturn(PETSC_SUCCESS);
347 }
348
349 24466 static PetscErrorCode DSUpdateExtraRow_HEP(DS ds)
350 {
351 24466 PetscInt i;
352 24466 PetscBLASInt n,ld,incx=1;
353 24466 PetscScalar *A,*x,*y,one=1.0,zero=0.0;
354 24466 PetscReal *T,*e,beta;
355 24466 const PetscScalar *Q;
356
357
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24466 PetscFunctionBegin;
358
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24466 PetscCall(PetscBLASIntCast(ds->n,&n));
359
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24466 PetscCall(PetscBLASIntCast(ds->ld,&ld));
360
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24466 PetscCall(MatDenseGetArrayRead(ds->omat[DS_MAT_Q],&Q));
361
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24466 if (ds->compact) {
362
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24436 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T));
363 24436 e = T+ld;
364 24436 beta = e[n-1]; /* in compact, we assume all entries are zero except the last one */
365
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447585 for (i=0;i<n;i++) e[i] = PetscRealPart(beta*Q[n-1+i*ld]);
366
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24436 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T));
367 24436 ds->k = n;
368 } else {
369
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30 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
370
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30 PetscCall(DSAllocateWork_Private(ds,2*ld,0,0));
371 30 x = ds->work;
372 30 y = ds->work+ld;
373
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390 for (i=0;i<n;i++) x[i] = PetscConj(A[n+i*ld]);
374
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30 PetscCallBLAS("BLASgemv",BLASgemv_("C",&n,&n,&one,Q,&ld,x,&incx,&zero,y,&incx));
375
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390 for (i=0;i<n;i++) A[n+i*ld] = PetscConj(y[i]);
376 30 ds->k = n;
377
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30 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
378 }
379
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24466 PetscCall(MatDenseRestoreArrayRead(ds->omat[DS_MAT_Q],&Q));
380
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4744 PetscFunctionReturn(PETSC_SUCCESS);
381 }
382
383 105765 static PetscErrorCode DSSolve_HEP_QR(DS ds,PetscScalar *wr,PetscScalar *wi)
384 {
385 105765 PetscInt i;
386 105765 PetscBLASInt n1,info,l = 0,n = 0,ld,off;
387 105765 PetscScalar *Q,*A;
388 105765 PetscReal *d,*e;
389
390
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105765 PetscFunctionBegin;
391
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105765 PetscCheck(ds->bs==1,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for bs>1");
392
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105765 PetscCall(PetscBLASIntCast(ds->n,&n));
393
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105765 PetscCall(PetscBLASIntCast(ds->l,&l));
394
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105765 PetscCall(PetscBLASIntCast(ds->ld,&ld));
395 105765 n1 = n-l; /* n1 = size of leading block, excl. locked + size of trailing block */
396 105765 off = l+l*ld;
397
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105765 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d));
398 105765 e = d+ld;
399
400 /* Reduce to tridiagonal form */
401
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105765 PetscCall(DSIntermediate_HEP(ds));
402
403 /* Solve the tridiagonal eigenproblem */
404
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188198 for (i=0;i<l;i++) wr[i] = d[i];
405
406
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105765 PetscCall(DSAllocateWork_Private(ds,0,2*ld,0));
407
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105765 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q));
408
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105765 PetscCallBLAS("LAPACKsteqr",LAPACKsteqr_("V",&n1,d+l,e+l,Q+off,&ld,ds->rwork,&info));
409
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105765 SlepcCheckLapackInfo("steqr",info);
410
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105765 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q));
411
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1476822 for (i=l;i<n;i++) wr[i] = d[i];
412
413 /* Create diagonal matrix as a result */
414
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105765 if (ds->compact) PetscCall(PetscArrayzero(e,n-1));
415 else {
416
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71172 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
417
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899802 for (i=l;i<n;i++) PetscCall(PetscArrayzero(A+l+i*ld,n-l));
418
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899802 for (i=l;i<n;i++) A[i+i*ld] = d[i];
419
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71172 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
420 }
421
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105765 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d));
422
423 /* Set zero wi */
424
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1303086 if (wi) for (i=l;i<n;i++) wi[i] = 0.0;
425
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20415 PetscFunctionReturn(PETSC_SUCCESS);
426 }
427
428 40 static PetscErrorCode DSSolve_HEP_MRRR(DS ds,PetscScalar *wr,PetscScalar *wi)
429 {
430 40 Mat At,Qt; /* trailing submatrices */
431 40 PetscInt i;
432 40 PetscBLASInt n1 = 0,n2 = 0,n3,lrwork,liwork,info,l = 0,n = 0,m = 0,ld,off,il,iu,*isuppz;
433 40 PetscScalar *A,*Q,*W=NULL,one=1.0,zero=0.0;
434 40 PetscReal *d,*e,abstol=0.0,vl,vu;
435 #if defined(PETSC_USE_COMPLEX)
436 20 PetscInt j;
437 20 PetscReal *Qr,*ritz;
438 #endif
439
440
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40 PetscFunctionBegin;
441
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40 PetscCheck(ds->bs==1,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for bs>1");
442
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40 PetscCall(PetscBLASIntCast(ds->n,&n));
443
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40 PetscCall(PetscBLASIntCast(ds->l,&l));
444
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40 PetscCall(PetscBLASIntCast(ds->ld,&ld));
445
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40 PetscCall(PetscBLASIntCast(ds->k-l+1,&n1)); /* size of leading block, excl. locked */
446
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40 PetscCall(PetscBLASIntCast(n-ds->k-1,&n2)); /* size of trailing block */
447 40 n3 = n1+n2;
448 40 off = l+l*ld;
449
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40 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d));
450 40 e = d+ld;
451
452 /* Reduce to tridiagonal form */
453
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40 PetscCall(DSIntermediate_HEP(ds));
454
455 /* Solve the tridiagonal eigenproblem */
456
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80 for (i=0;i<l;i++) wr[i] = d[i];
457
458
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40 if (ds->state<DS_STATE_INTERMEDIATE) { /* Q contains useful info */
459
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40 PetscCall(DSAllocateMat_Private(ds,DS_MAT_W));
460
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40 PetscCall(MatCopy(ds->omat[DS_MAT_Q],ds->omat[DS_MAT_W],SAME_NONZERO_PATTERN));
461 }
462
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40 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q));
463 40 lrwork = 20*ld;
464 40 liwork = 10*ld;
465 #if defined(PETSC_USE_COMPLEX)
466
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20 PetscCall(DSAllocateWork_Private(ds,0,lrwork+ld+ld*ld,liwork+2*ld));
467 #else
468
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20 PetscCall(DSAllocateWork_Private(ds,0,lrwork+ld,liwork+2*ld));
469 #endif
470 40 isuppz = ds->iwork+liwork;
471 #if defined(PETSC_USE_COMPLEX)
472 20 ritz = ds->rwork+lrwork;
473 20 Qr = ds->rwork+lrwork+ld;
474
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20 PetscCallBLAS("LAPACKstevr",LAPACKstevr_("V","A",&n3,d+l,e+l,&vl,&vu,&il,&iu,&abstol,&m,ritz+l,Qr+off,&ld,isuppz,ds->rwork,&lrwork,ds->iwork,&liwork,&info));
475
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210 for (i=l;i<n;i++) wr[i] = ritz[i];
476 #else
477
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20 PetscCallBLAS("LAPACKstevr",LAPACKstevr_("V","A",&n3,d+l,e+l,&vl,&vu,&il,&iu,&abstol,&m,wr+l,Q+off,&ld,isuppz,ds->rwork,&lrwork,ds->iwork,&liwork,&info));
478 #endif
479
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40 SlepcCheckLapackInfo("stevr",info);
480 #if defined(PETSC_USE_COMPLEX)
481
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210 for (i=l;i<n;i++)
482
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2120 for (j=l;j<n;j++)
483 1930 Q[i+j*ld] = Qr[i+j*ld];
484 #endif
485
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40 if (ds->state<DS_STATE_INTERMEDIATE) { /* accumulate previous Q */
486
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40 if (ds->compact) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A));
487
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40 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
488
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40 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_W],&W));
489
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40 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&n3,&n3,&n3,&one,W+off,&ld,Q+off,&ld,&zero,A+off,&ld));
490
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40 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
491
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40 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_W],&W));
492
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40 PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_A],ds->l,ds->n,ds->l,ds->n,&At));
493
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40 PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_Q],ds->l,ds->n,ds->l,ds->n,&Qt));
494
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40 PetscCall(MatCopy(At,Qt,SAME_NONZERO_PATTERN));
495
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40 PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_A],&At));
496
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40 PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_Q],&Qt));
497 }
498
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40 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q));
499
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420 for (i=l;i<n;i++) d[i] = PetscRealPart(wr[i]);
500
501 /* Create diagonal matrix as a result */
502
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40 if (ds->compact) PetscCall(PetscArrayzero(e,n-1));
503 else {
504
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20 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
505
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260 for (i=l;i<n;i++) PetscCall(PetscArrayzero(A+l+i*ld,n-l));
506
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260 for (i=l;i<n;i++) A[i+i*ld] = d[i];
507
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20 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
508 }
509
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40 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d));
510
511 /* Set zero wi */
512
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40 if (wi) for (i=l;i<n;i++) wi[i] = 0.0;
513
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8 PetscFunctionReturn(PETSC_SUCCESS);
514 }
515
516 40 static PetscErrorCode DSSolve_HEP_DC(DS ds,PetscScalar *wr,PetscScalar *wi)
517 {
518 40 PetscInt i;
519 40 PetscBLASInt n1,info,l = 0,ld,off,lrwork,liwork;
520 40 PetscScalar *Q,*A;
521 40 PetscReal *d,*e;
522 #if defined(PETSC_USE_COMPLEX)
523 20 PetscBLASInt lwork;
524 20 PetscInt j;
525 #endif
526
527
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40 PetscFunctionBegin;
528
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40 PetscCheck(ds->bs==1,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for bs>1");
529
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40 PetscCall(PetscBLASIntCast(ds->l,&l));
530
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40 PetscCall(PetscBLASIntCast(ds->ld,&ld));
531
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40 PetscCall(PetscBLASIntCast(ds->n-ds->l,&n1));
532 40 off = l+l*ld;
533
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40 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d));
534 40 e = d+ld;
535
536 /* Reduce to tridiagonal form */
537
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40 PetscCall(DSIntermediate_HEP(ds));
538
539 /* Solve the tridiagonal eigenproblem */
540
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80 for (i=0;i<l;i++) wr[i] = d[i];
541
542 40 lrwork = 5*n1*n1+3*n1+1;
543 40 liwork = 5*n1*n1+6*n1+6;
544
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40 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q));
545 #if !defined(PETSC_USE_COMPLEX)
546
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20 PetscCall(DSAllocateWork_Private(ds,0,lrwork,liwork));
547
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20 PetscCallBLAS("LAPACKstedc",LAPACKstedc_("V",&n1,d+l,e+l,Q+off,&ld,ds->rwork,&lrwork,ds->iwork,&liwork,&info));
548 #else
549 20 lwork = ld*ld;
550
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20 PetscCall(DSAllocateWork_Private(ds,lwork,lrwork,liwork));
551
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20 PetscCallBLAS("LAPACKstedc",LAPACKstedc_("V",&n1,d+l,e+l,Q+off,&ld,ds->work,&lwork,ds->rwork,&lrwork,ds->iwork,&liwork,&info));
552 /* Fixing Lapack bug*/
553
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210 for (j=ds->l;j<ds->n;j++)
554
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330 for (i=0;i<ds->l;i++) Q[i+j*ld] = 0.0;
555 #endif
556
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40 SlepcCheckLapackInfo("stedc",info);
557
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40 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q));
558
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420 for (i=l;i<ds->n;i++) wr[i] = d[i];
559
560 /* Create diagonal matrix as a result */
561
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40 if (ds->compact) PetscCall(PetscArrayzero(e,ds->n-1));
562 else {
563
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20 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
564
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260 for (i=l;i<ds->n;i++) PetscCall(PetscArrayzero(A+l+i*ld,ds->n-l));
565
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260 for (i=l;i<ds->n;i++) A[i+i*ld] = d[i];
566
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20 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
567 }
568
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40 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d));
569
570 /* Set zero wi */
571
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40 if (wi) for (i=l;i<ds->n;i++) wi[i] = 0.0;
572
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8 PetscFunctionReturn(PETSC_SUCCESS);
573 }
574
575 #if !defined(PETSC_USE_COMPLEX)
576 10 static PetscErrorCode DSSolve_HEP_BDC(DS ds,PetscScalar *wr,PetscScalar *wi)
577 {
578 10 PetscBLASInt i,j,k,m,n = 0,info,nblks,bs = 0,ld = 0,lde,lrwork,liwork,*ksizes,*iwork,mingapi;
579 10 PetscScalar *Q,*A;
580 10 PetscReal *D,*E,*d,*e,tol=PETSC_MACHINE_EPSILON/2,tau1=1e-16,tau2=1e-18,*rwork,mingap;
581
582
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10 PetscFunctionBegin;
583
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10 PetscCheck(ds->l==0,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for l>1");
584
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10 PetscCheck(!ds->compact,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"Not implemented for compact storage");
585
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10 PetscCall(PetscBLASIntCast(ds->ld,&ld));
586
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10 PetscCall(PetscBLASIntCast(ds->bs,&bs));
587
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10 PetscCall(PetscBLASIntCast(ds->n,&n));
588 10 nblks = n/bs;
589
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10 PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d));
590 10 e = d+ld;
591 10 lrwork = 4*n*n+60*n+1;
592 10 liwork = 5*n+5*nblks-1;
593 10 lde = 2*bs+1;
594
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10 PetscCall(DSAllocateWork_Private(ds,bs*n+lde*lde*(nblks-1),lrwork,nblks+liwork));
595 10 D = ds->work;
596 10 E = ds->work+bs*n;
597 10 rwork = ds->rwork;
598 10 ksizes = ds->iwork;
599 10 iwork = ds->iwork+nblks;
600
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10 PetscCall(PetscArrayzero(iwork,liwork));
601
602 /* Copy matrix to block tridiagonal format */
603
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10 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
604 j=0;
605
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55 for (i=0;i<nblks;i++) {
606 45 ksizes[i]=bs;
607
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180 for (k=0;k<bs;k++)
608
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540 for (m=0;m<bs;m++)
609 405 D[k+m*bs+i*bs*bs] = PetscRealPart(A[j+k+(j+m)*n]);
610 45 j = j + bs;
611 }
612 j=0;
613
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45 for (i=0;i<nblks-1;i++) {
614
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140 for (k=0;k<bs;k++)
615
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420 for (m=0;m<bs;m++)
616 315 E[k+m*lde+i*lde*lde] = PetscRealPart(A[j+bs+k+(j+m)*n]);
617 35 j = j + bs;
618 }
619
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10 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
620
621 /* Solve the block tridiagonal eigenproblem */
622
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10 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q));
623
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10 PetscCall(BDC_dsbtdc_("D","A",n,nblks,ksizes,D,bs,bs,E,lde,lde,tol,tau1,tau2,d,Q,n,rwork,lrwork,iwork,liwork,&mingap,&mingapi,&info,1,1));
624
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10 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q));
625
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145 for (i=0;i<ds->n;i++) wr[i] = d[i];
626
627 /* Create diagonal matrix as a result */
628
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10 if (ds->compact) PetscCall(PetscArrayzero(e,ds->n-1));
629 else {
630
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10 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
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145 for (i=0;i<ds->n;i++) PetscCall(PetscArrayzero(A+i*ld,ds->n));
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145 for (i=0;i<ds->n;i++) A[i+i*ld] = wr[i];
633
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10 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
634 }
635
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10 PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d));
636
637 /* Set zero wi */
638
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10 if (wi) for (i=0;i<ds->n;i++) wi[i] = 0.0;
639
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2 PetscFunctionReturn(PETSC_SUCCESS);
640 }
641 #endif
642
643 24557 static PetscErrorCode DSTruncate_HEP(DS ds,PetscInt n,PetscBool trim)
644 {
645 24557 PetscInt i,ld=ds->ld,l=ds->l;
646 24557 PetscScalar *A;
647
648
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24557 PetscFunctionBegin;
649
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24557 if (!ds->compact && ds->extrarow) PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
650
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24557 if (trim) {
651
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2637 if (!ds->compact && ds->extrarow) { /* clean extra row */
652 for (i=l;i<ds->n;i++) A[ds->n+i*ld] = 0.0;
653 }
654 2637 ds->l = 0;
655 2637 ds->k = 0;
656 2637 ds->n = n;
657 2637 ds->t = ds->n; /* truncated length equal to the new dimension */
658 } else {
659
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21920 if (!ds->compact && ds->extrarow && ds->k==ds->n) {
660 /* copy entries of extra row to the new position, then clean last row */
661 for (i=l;i<n;i++) A[n+i*ld] = A[ds->n+i*ld];
662 for (i=l;i<ds->n;i++) A[ds->n+i*ld] = 0.0;
663 }
664
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21920 ds->k = (ds->extrarow)? n: 0;
665 21920 ds->t = ds->n; /* truncated length equal to previous dimension */
666 21920 ds->n = n;
667 }
668
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24557 if (!ds->compact && ds->extrarow) PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
669
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4759 PetscFunctionReturn(PETSC_SUCCESS);
670 }
671
672 #if !defined(PETSC_HAVE_MPIUNI)
673 20 static PetscErrorCode DSSynchronize_HEP(DS ds,PetscScalar eigr[],PetscScalar eigi[])
674 {
675 20 PetscInt ld=ds->ld,l=ds->l,k=0,kr=0;
676 20 PetscMPIInt n,rank,off=0,size,ldn,ld3;
677 20 PetscScalar *A,*Q;
678 20 PetscReal *T;
679
680
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20 PetscFunctionBegin;
681
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20 if (ds->compact) kr = 3*ld;
682 else k = (ds->n-l)*ld;
683
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20 if (ds->state>DS_STATE_RAW) k += (ds->n-l)*ld;
684
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20 if (eigr) k += (ds->n-l);
685
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20 PetscCall(DSAllocateWork_Private(ds,k+kr,0,0));
686
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20 PetscCall(PetscMPIIntCast(k*sizeof(PetscScalar)+kr*sizeof(PetscReal),&size));
687
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20 PetscCall(PetscMPIIntCast(ds->n-l,&n));
688
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20 PetscCall(PetscMPIIntCast(ld*(ds->n-l),&ldn));
689
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20 PetscCall(PetscMPIIntCast(ld*3,&ld3));
690
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20 if (ds->compact) PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T));
691 else PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
692
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20 if (ds->state>DS_STATE_RAW) PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q));
693
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20 PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)ds),&rank));
694
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20 if (!rank) {
695
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10 if (ds->compact) PetscCallMPI(MPI_Pack(T,ld3,MPIU_REAL,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
696 else PetscCallMPI(MPI_Pack(A+l*ld,ldn,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
697
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10 if (ds->state>DS_STATE_RAW) PetscCallMPI(MPI_Pack(Q+l*ld,ldn,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
698
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10 if (eigr) PetscCallMPI(MPI_Pack(eigr+l,n,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds)));
699 }
700
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40 PetscCallMPI(MPI_Bcast(ds->work,size,MPI_BYTE,0,PetscObjectComm((PetscObject)ds)));
701
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20 if (rank) {
702
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10 if (ds->compact) PetscCallMPI(MPI_Unpack(ds->work,size,&off,T,ld3,MPIU_REAL,PetscObjectComm((PetscObject)ds)));
703 else PetscCallMPI(MPI_Unpack(ds->work,size,&off,A+l*ld,ldn,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
704
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10 if (ds->state>DS_STATE_RAW) PetscCallMPI(MPI_Unpack(ds->work,size,&off,Q+l*ld,ldn,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
705
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10 if (eigr) PetscCallMPI(MPI_Unpack(ds->work,size,&off,eigr+l,n,MPIU_SCALAR,PetscObjectComm((PetscObject)ds)));
706 }
707
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20 if (ds->compact) PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T));
708 else PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
709
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20 if (ds->state>DS_STATE_RAW) PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q));
710
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4 PetscFunctionReturn(PETSC_SUCCESS);
711 }
712 #endif
713
714 1326 static PetscErrorCode DSCond_HEP(DS ds,PetscReal *cond)
715 {
716 1326 PetscScalar *work;
717 1326 PetscReal *rwork;
718 1326 PetscBLASInt *ipiv;
719 1326 PetscBLASInt lwork,info,n,ld;
720 1326 PetscReal hn,hin;
721 1326 PetscScalar *A;
722
723
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1326 PetscFunctionBegin;
724
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1326 PetscCall(PetscBLASIntCast(ds->n,&n));
725
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1326 PetscCall(PetscBLASIntCast(ds->ld,&ld));
726 1326 lwork = 8*ld;
727
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1326 PetscCall(DSAllocateWork_Private(ds,lwork,ld,ld));
728 1326 work = ds->work;
729 1326 rwork = ds->rwork;
730 1326 ipiv = ds->iwork;
731
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1326 if (ds->compact) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A));
732
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1326 PetscCall(DSSwitchFormat_HEP(ds));
733
734 /* use workspace matrix W to avoid overwriting A */
735
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1326 PetscCall(DSAllocateMat_Private(ds,DS_MAT_W));
736
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1326 PetscCall(MatCopy(ds->omat[DS_MAT_A],ds->omat[DS_MAT_W],SAME_NONZERO_PATTERN));
737
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1326 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_W],&A));
738
739 /* norm of A */
740 1326 hn = LAPACKlange_("I",&n,&n,A,&ld,rwork);
741
742 /* norm of inv(A) */
743
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1326 PetscCallBLAS("LAPACKgetrf",LAPACKgetrf_(&n,&n,A,&ld,ipiv,&info));
744
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1326 SlepcCheckLapackInfo("getrf",info);
745
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1326 PetscCallBLAS("LAPACKgetri",LAPACKgetri_(&n,A,&ld,ipiv,work,&lwork,&info));
746
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1326 SlepcCheckLapackInfo("getri",info);
747 1326 hin = LAPACKlange_("I",&n,&n,A,&ld,rwork);
748
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1326 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_W],&A));
749
750 1326 *cond = hn*hin;
751
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1326 PetscFunctionReturn(PETSC_SUCCESS);
752 }
753
754 124 static PetscErrorCode DSTranslateRKS_HEP(DS ds,PetscScalar alpha)
755 {
756 124 PetscInt i,j,k=ds->k;
757 124 PetscScalar *Q,*A,*R,*tau,*work;
758 124 PetscBLASInt ld,n1,n0,lwork,info;
759
760
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124 PetscFunctionBegin;
761
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124 PetscCall(PetscBLASIntCast(ds->ld,&ld));
762
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124 PetscCall(DSAllocateWork_Private(ds,ld*ld,0,0));
763 124 tau = ds->work;
764 124 work = ds->work+ld;
765
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124 PetscCall(PetscBLASIntCast(ld*(ld-1),&lwork));
766
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124 PetscCall(DSAllocateMat_Private(ds,DS_MAT_W));
767
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124 PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A));
768
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124 PetscCall(MatDenseGetArrayWrite(ds->omat[DS_MAT_Q],&Q));
769
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124 PetscCall(MatDenseGetArrayWrite(ds->omat[DS_MAT_W],&R));
770
771 /* copy I+alpha*A */
772
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124 PetscCall(PetscArrayzero(Q,ld*ld));
773
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124 PetscCall(PetscArrayzero(R,ld*ld));
774
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1828 for (i=0;i<k;i++) {
775 1704 Q[i+i*ld] = 1.0 + alpha*A[i+i*ld];
776 1704 Q[k+i*ld] = alpha*A[k+i*ld];
777 }
778
779 /* compute qr */
780
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124 PetscCall(PetscBLASIntCast(k+1,&n1));
781
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124 PetscCall(PetscBLASIntCast(k,&n0));
782
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124 PetscCallBLAS("LAPACKgeqrf",LAPACKgeqrf_(&n1,&n0,Q,&ld,tau,work,&lwork,&info));
783
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124 SlepcCheckLapackInfo("geqrf",info);
784
785 /* copy R from Q */
786
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1828 for (j=0;j<k;j++)
787
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14538 for (i=0;i<=j;i++)
788 12834 R[i+j*ld] = Q[i+j*ld];
789
790 /* compute orthogonal matrix in Q */
791
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124 PetscCallBLAS("LAPACKorgqr",LAPACKorgqr_(&n1,&n1,&n0,Q,&ld,tau,work,&lwork,&info));
792
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124 SlepcCheckLapackInfo("orgqr",info);
793
794 /* compute the updated matrix of projected problem */
795
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1828 for (j=0;j<k;j++)
796
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27372 for (i=0;i<k+1;i++)
797 25668 A[j*ld+i] = Q[i*ld+j];
798 124 alpha = -1.0/alpha;
799
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124 PetscCallBLAS("BLAStrsm",BLAStrsm_("R","U","N","N",&n1,&n0,&alpha,R,&ld,A,&ld));
800
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1828 for (i=0;i<k;i++)
801 1704 A[ld*i+i] -= alpha;
802
803
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124 PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A));
804
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124 PetscCall(MatDenseRestoreArrayWrite(ds->omat[DS_MAT_Q],&Q));
805
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124 PetscCall(MatDenseRestoreArrayWrite(ds->omat[DS_MAT_W],&R));
806
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21 PetscFunctionReturn(PETSC_SUCCESS);
807 }
808
809 236631 static PetscErrorCode DSHermitian_HEP(DS ds,DSMatType m,PetscBool *flg)
810 {
811
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236631 PetscFunctionBegin;
812
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236631 if (m==DS_MAT_A && !ds->extrarow) *flg = PETSC_TRUE;
813 164693 else *flg = PETSC_FALSE;
814
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236631 PetscFunctionReturn(PETSC_SUCCESS);
815 }
816
817 684 static PetscErrorCode DSSetCompact_HEP(DS ds,PetscBool comp)
818 {
819
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684 PetscFunctionBegin;
820
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684 if (!comp) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A));
821
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126 PetscFunctionReturn(PETSC_SUCCESS);
822 }
823
824 48 static PetscErrorCode DSReallocate_HEP(DS ds,PetscInt ld)
825 {
826 48 PetscInt i,*perm=ds->perm;
827
828
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48 PetscFunctionBegin;
829
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1104 for (i=0;i<DS_NUM_MAT;i++) {
830
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1056 if (!ds->compact && i==DS_MAT_A) continue;
831
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1056 if (i!=DS_MAT_Q && i!=DS_MAT_T) PetscCall(MatDestroy(&ds->omat[i]));
832 }
833
834
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48 if (!ds->compact) PetscCall(DSReallocateMat_Private(ds,DS_MAT_A,ld));
835
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48 PetscCall(DSReallocateMat_Private(ds,DS_MAT_Q,ld));
836
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48 PetscCall(DSReallocateMat_Private(ds,DS_MAT_T,ld));
837
838
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48 PetscCall(PetscMalloc1(ld,&ds->perm));
839
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48 PetscCall(PetscArraycpy(ds->perm,perm,ds->ld));
840
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48 PetscCall(PetscFree(perm));
841
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10 PetscFunctionReturn(PETSC_SUCCESS);
842 }
843
844 /*MC
845 DSHEP - Dense Hermitian Eigenvalue Problem.
846
847 Level: beginner
848
849 Notes:
850 The problem is expressed as A*X = X*Lambda, where A is real symmetric
851 (or complex Hermitian). Lambda is a diagonal matrix whose diagonal
852 elements are the arguments of DSSolve(). After solve, A is overwritten
853 with Lambda.
854
855 In the intermediate state A is reduced to tridiagonal form. In compact
856 storage format, the symmetric tridiagonal matrix is stored in T.
857
858 Used DS matrices:
859 + DS_MAT_A - problem matrix (used only if compact=false)
860 . DS_MAT_T - symmetric tridiagonal matrix
861 - DS_MAT_Q - orthogonal/unitary transformation that reduces to tridiagonal form
862 (intermediate step) or matrix of orthogonal eigenvectors, which is equal to X
863
864 Implemented methods:
865 + 0 - Implicit QR (_steqr)
866 . 1 - Multiple Relatively Robust Representations (_stevr)
867 . 2 - Divide and Conquer (_stedc)
868 - 3 - Block Divide and Conquer (real scalars only)
869
870 .seealso: DSCreate(), DSSetType(), DSType
871 M*/
872 3430 SLEPC_EXTERN PetscErrorCode DSCreate_HEP(DS ds)
873 {
874
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3430 PetscFunctionBegin;
875 3430 ds->ops->allocate = DSAllocate_HEP;
876 3430 ds->ops->view = DSView_HEP;
877 3430 ds->ops->vectors = DSVectors_HEP;
878 3430 ds->ops->solve[0] = DSSolve_HEP_QR;
879 3430 ds->ops->solve[1] = DSSolve_HEP_MRRR;
880 3430 ds->ops->solve[2] = DSSolve_HEP_DC;
881 #if !defined(PETSC_USE_COMPLEX)
882 1742 ds->ops->solve[3] = DSSolve_HEP_BDC;
883 #endif
884 3430 ds->ops->sort = DSSort_HEP;
885 3430 ds->ops->truncate = DSTruncate_HEP;
886 3430 ds->ops->update = DSUpdateExtraRow_HEP;
887 3430 ds->ops->cond = DSCond_HEP;
888 3430 ds->ops->transrks = DSTranslateRKS_HEP;
889 3430 ds->ops->hermitian = DSHermitian_HEP;
890 #if !defined(PETSC_HAVE_MPIUNI)
891 3430 ds->ops->synchronize = DSSynchronize_HEP;
892 #endif
893 3430 ds->ops->setcompact = DSSetCompact_HEP;
894 3430 ds->ops->reallocate = DSReallocate_HEP;
895
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3430 PetscFunctionReturn(PETSC_SUCCESS);
896 }
897