Line data Source code
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 : The ST interface routines, callable by users
12 : */
13 :
14 : #include <slepc/private/stimpl.h> /*I "slepcst.h" I*/
15 :
16 : PetscClassId ST_CLASSID = 0;
17 : PetscLogEvent ST_SetUp = 0,ST_ComputeOperator = 0,ST_Apply = 0,ST_ApplyTranspose = 0,ST_ApplyHermitianTranspose = 0,ST_MatSetUp = 0,ST_MatMult = 0,ST_MatMultTranspose = 0,ST_MatSolve = 0,ST_MatSolveTranspose = 0;
18 : static PetscBool STPackageInitialized = PETSC_FALSE;
19 :
20 : const char *STMatModes[] = {"COPY","INPLACE","SHELL","STMatMode","ST_MATMODE_",NULL};
21 :
22 : /*@C
23 : STFinalizePackage - This function destroys everything in the Slepc interface
24 : to the ST package. It is called from SlepcFinalize().
25 :
26 : Level: developer
27 :
28 : .seealso: SlepcFinalize()
29 : @*/
30 739 : PetscErrorCode STFinalizePackage(void)
31 : {
32 739 : PetscFunctionBegin;
33 739 : PetscCall(PetscFunctionListDestroy(&STList));
34 739 : STPackageInitialized = PETSC_FALSE;
35 739 : STRegisterAllCalled = PETSC_FALSE;
36 739 : PetscFunctionReturn(PETSC_SUCCESS);
37 : }
38 :
39 : /*@C
40 : STInitializePackage - This function initializes everything in the ST package.
41 : It is called from PetscDLLibraryRegister() when using dynamic libraries, and
42 : on the first call to STCreate() when using static libraries.
43 :
44 : Level: developer
45 :
46 : .seealso: SlepcInitialize()
47 : @*/
48 5260 : PetscErrorCode STInitializePackage(void)
49 : {
50 5260 : char logList[256];
51 5260 : PetscBool opt,pkg;
52 5260 : PetscClassId classids[1];
53 :
54 5260 : PetscFunctionBegin;
55 5260 : if (STPackageInitialized) PetscFunctionReturn(PETSC_SUCCESS);
56 739 : STPackageInitialized = PETSC_TRUE;
57 : /* Register Classes */
58 739 : PetscCall(PetscClassIdRegister("Spectral Transform",&ST_CLASSID));
59 : /* Register Constructors */
60 739 : PetscCall(STRegisterAll());
61 : /* Register Events */
62 739 : PetscCall(PetscLogEventRegister("STSetUp",ST_CLASSID,&ST_SetUp));
63 739 : PetscCall(PetscLogEventRegister("STComputeOperatr",ST_CLASSID,&ST_ComputeOperator));
64 739 : PetscCall(PetscLogEventRegister("STApply",ST_CLASSID,&ST_Apply));
65 739 : PetscCall(PetscLogEventRegister("STApplyTranspose",ST_CLASSID,&ST_ApplyTranspose));
66 739 : PetscCall(PetscLogEventRegister("STApplyHermTrans",ST_CLASSID,&ST_ApplyHermitianTranspose));
67 739 : PetscCall(PetscLogEventRegister("STMatSetUp",ST_CLASSID,&ST_MatSetUp));
68 739 : PetscCall(PetscLogEventRegister("STMatMult",ST_CLASSID,&ST_MatMult));
69 739 : PetscCall(PetscLogEventRegister("STMatMultTranspose",ST_CLASSID,&ST_MatMultTranspose));
70 739 : PetscCall(PetscLogEventRegister("STMatSolve",ST_CLASSID,&ST_MatSolve));
71 739 : PetscCall(PetscLogEventRegister("STMatSolveTranspose",ST_CLASSID,&ST_MatSolveTranspose));
72 : /* Process Info */
73 739 : classids[0] = ST_CLASSID;
74 739 : PetscCall(PetscInfoProcessClass("st",1,&classids[0]));
75 : /* Process summary exclusions */
76 739 : PetscCall(PetscOptionsGetString(NULL,NULL,"-log_exclude",logList,sizeof(logList),&opt));
77 739 : if (opt) {
78 8 : PetscCall(PetscStrInList("st",logList,',',&pkg));
79 8 : if (pkg) PetscCall(PetscLogEventDeactivateClass(ST_CLASSID));
80 : }
81 : /* Register package finalizer */
82 739 : PetscCall(PetscRegisterFinalize(STFinalizePackage));
83 739 : PetscFunctionReturn(PETSC_SUCCESS);
84 : }
85 :
86 : /*@
87 : STReset - Resets the ST context to the initial state (prior to setup)
88 : and destroys any allocated Vecs and Mats.
89 :
90 : Collective
91 :
92 : Input Parameter:
93 : . st - the spectral transformation context
94 :
95 : Level: advanced
96 :
97 : .seealso: STDestroy()
98 : @*/
99 1866 : PetscErrorCode STReset(ST st)
100 : {
101 1866 : PetscFunctionBegin;
102 1866 : if (st) PetscValidHeaderSpecific(st,ST_CLASSID,1);
103 1866 : if (!st) PetscFunctionReturn(PETSC_SUCCESS);
104 1866 : STCheckNotSeized(st,1);
105 1866 : PetscTryTypeMethod(st,reset);
106 1866 : if (st->ksp) PetscCall(KSPReset(st->ksp));
107 1866 : PetscCall(MatDestroyMatrices(PetscMax(2,st->nmat),&st->T));
108 1866 : PetscCall(MatDestroyMatrices(PetscMax(2,st->nmat),&st->A));
109 1866 : st->nmat = 0;
110 1866 : PetscCall(PetscFree(st->Astate));
111 1866 : PetscCall(MatDestroy(&st->Op));
112 1866 : PetscCall(MatDestroy(&st->P));
113 1866 : PetscCall(MatDestroy(&st->Pmat));
114 1866 : PetscCall(MatDestroyMatrices(st->nsplit,&st->Psplit));
115 1866 : st->nsplit = 0;
116 1866 : PetscCall(VecDestroyVecs(st->nwork,&st->work));
117 1866 : st->nwork = 0;
118 1866 : PetscCall(VecDestroy(&st->wb));
119 1866 : PetscCall(VecDestroy(&st->wht));
120 1866 : PetscCall(VecDestroy(&st->D));
121 1866 : st->state = ST_STATE_INITIAL;
122 1866 : st->opready = PETSC_FALSE;
123 1866 : PetscFunctionReturn(PETSC_SUCCESS);
124 : }
125 :
126 : /*@
127 : STDestroy - Destroys ST context that was created with STCreate().
128 :
129 : Collective
130 :
131 : Input Parameter:
132 : . st - the spectral transformation context
133 :
134 : Level: beginner
135 :
136 : .seealso: STCreate(), STSetUp()
137 : @*/
138 829 : PetscErrorCode STDestroy(ST *st)
139 : {
140 829 : PetscFunctionBegin;
141 829 : if (!*st) PetscFunctionReturn(PETSC_SUCCESS);
142 827 : PetscValidHeaderSpecific(*st,ST_CLASSID,1);
143 827 : if (--((PetscObject)*st)->refct > 0) { *st = NULL; PetscFunctionReturn(PETSC_SUCCESS); }
144 825 : PetscCall(STReset(*st));
145 825 : PetscTryTypeMethod(*st,destroy);
146 825 : PetscCall(KSPDestroy(&(*st)->ksp));
147 825 : PetscCall(PetscHeaderDestroy(st));
148 825 : PetscFunctionReturn(PETSC_SUCCESS);
149 : }
150 :
151 : /*@
152 : STCreate - Creates a spectral transformation context.
153 :
154 : Collective
155 :
156 : Input Parameter:
157 : . comm - MPI communicator
158 :
159 : Output Parameter:
160 : . newst - location to put the spectral transformation context
161 :
162 : Level: beginner
163 :
164 : .seealso: STSetUp(), STApply(), STDestroy(), ST
165 : @*/
166 825 : PetscErrorCode STCreate(MPI_Comm comm,ST *newst)
167 : {
168 825 : ST st;
169 :
170 825 : PetscFunctionBegin;
171 825 : PetscAssertPointer(newst,2);
172 825 : PetscCall(STInitializePackage());
173 825 : PetscCall(SlepcHeaderCreate(st,ST_CLASSID,"ST","Spectral Transformation","ST",comm,STDestroy,STView));
174 :
175 825 : st->A = NULL;
176 825 : st->nmat = 0;
177 825 : st->sigma = 0.0;
178 825 : st->defsigma = 0.0;
179 825 : st->matmode = ST_MATMODE_COPY;
180 825 : st->str = UNKNOWN_NONZERO_PATTERN;
181 825 : st->transform = PETSC_FALSE;
182 825 : st->structured = PETSC_FALSE;
183 825 : st->D = NULL;
184 825 : st->Pmat = NULL;
185 825 : st->Pmat_set = PETSC_FALSE;
186 825 : st->Psplit = NULL;
187 825 : st->nsplit = 0;
188 825 : st->strp = UNKNOWN_NONZERO_PATTERN;
189 :
190 825 : st->ksp = NULL;
191 825 : st->usesksp = PETSC_FALSE;
192 825 : st->nwork = 0;
193 825 : st->work = NULL;
194 825 : st->wb = NULL;
195 825 : st->wht = NULL;
196 825 : st->state = ST_STATE_INITIAL;
197 825 : st->Astate = NULL;
198 825 : st->T = NULL;
199 825 : st->Op = NULL;
200 825 : st->opseized = PETSC_FALSE;
201 825 : st->opready = PETSC_FALSE;
202 825 : st->P = NULL;
203 825 : st->M = NULL;
204 825 : st->sigma_set = PETSC_FALSE;
205 825 : st->asymm = PETSC_FALSE;
206 825 : st->aherm = PETSC_FALSE;
207 825 : st->data = NULL;
208 :
209 825 : *newst = st;
210 825 : PetscFunctionReturn(PETSC_SUCCESS);
211 : }
212 :
213 : /*
214 : Checks whether the ST matrices are all symmetric or hermitian.
215 : */
216 913 : static inline PetscErrorCode STMatIsSymmetricKnown(ST st,PetscBool *symm,PetscBool *herm)
217 : {
218 913 : PetscInt i;
219 913 : PetscBool sbaij=PETSC_FALSE,set,flg=PETSC_FALSE;
220 :
221 913 : PetscFunctionBegin;
222 : /* check if problem matrices are all sbaij */
223 925 : for (i=0;i<st->nmat;i++) {
224 919 : PetscCall(PetscObjectTypeCompareAny((PetscObject)st->A[i],&sbaij,MATSEQSBAIJ,MATMPISBAIJ,""));
225 919 : if (!sbaij) break;
226 : }
227 : /* check if user has set the symmetric flag */
228 913 : *symm = PETSC_TRUE;
229 989 : for (i=0;i<st->nmat;i++) {
230 951 : PetscCall(MatIsSymmetricKnown(st->A[i],&set,&flg));
231 951 : if (!set || !flg) { *symm = PETSC_FALSE; break; }
232 : }
233 913 : if (sbaij) *symm = PETSC_TRUE;
234 : #if defined(PETSC_USE_COMPLEX)
235 : /* check if user has set the hermitian flag */
236 : *herm = PETSC_TRUE;
237 : for (i=0;i<st->nmat;i++) {
238 : PetscCall(MatIsHermitianKnown(st->A[i],&set,&flg));
239 : if (!set || !flg) { *herm = PETSC_FALSE; break; }
240 : }
241 : #else
242 913 : *herm = *symm;
243 : #endif
244 913 : PetscFunctionReturn(PETSC_SUCCESS);
245 : }
246 :
247 : /*@
248 : STSetMatrices - Sets the matrices associated with the eigenvalue problem.
249 :
250 : Collective
251 :
252 : Input Parameters:
253 : + st - the spectral transformation context
254 : . n - number of matrices in array A
255 : - A - the array of matrices associated with the eigensystem
256 :
257 : Notes:
258 : It must be called before STSetUp(). If it is called again after STSetUp() then
259 : the ST object is reset.
260 :
261 : Level: intermediate
262 :
263 : .seealso: STGetMatrix(), STGetNumMatrices(), STSetUp(), STReset()
264 : @*/
265 950 : PetscErrorCode STSetMatrices(ST st,PetscInt n,Mat A[])
266 : {
267 950 : PetscInt i;
268 950 : PetscBool same=PETSC_TRUE;
269 :
270 950 : PetscFunctionBegin;
271 950 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
272 2850 : PetscValidLogicalCollectiveInt(st,n,2);
273 950 : PetscCheck(n>0,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"Must have one or more matrices, you have %" PetscInt_FMT,n);
274 950 : PetscAssertPointer(A,3);
275 950 : PetscCheckSameComm(st,1,*A,3);
276 950 : STCheckNotSeized(st,1);
277 950 : PetscCheck(!st->nsplit || st->nsplit==n,PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"The number of matrices must be the same as in STSetSplitPreconditioner()");
278 :
279 950 : if (st->state) {
280 74 : if (n!=st->nmat) same = PETSC_FALSE;
281 161 : for (i=0;same&&i<n;i++) {
282 87 : if (A[i]!=st->A[i]) same = PETSC_FALSE;
283 : }
284 74 : if (!same) PetscCall(STReset(st));
285 : } else same = PETSC_FALSE;
286 74 : if (!same) {
287 913 : PetscCall(MatDestroyMatrices(PetscMax(2,st->nmat),&st->A));
288 913 : PetscCall(PetscCalloc1(PetscMax(2,n),&st->A));
289 913 : PetscCall(PetscFree(st->Astate));
290 913 : PetscCall(PetscMalloc1(PetscMax(2,n),&st->Astate));
291 : }
292 2642 : for (i=0;i<n;i++) {
293 1692 : PetscValidHeaderSpecific(A[i],MAT_CLASSID,3);
294 1692 : PetscCall(PetscObjectReference((PetscObject)A[i]));
295 1692 : PetscCall(MatDestroy(&st->A[i]));
296 1692 : st->A[i] = A[i];
297 1692 : st->Astate[i] = ((PetscObject)A[i])->state;
298 : }
299 950 : if (n==1) {
300 533 : st->A[1] = NULL;
301 533 : st->Astate[1] = 0;
302 : }
303 950 : st->nmat = n;
304 950 : if (same) st->state = ST_STATE_UPDATED;
305 913 : else st->state = ST_STATE_INITIAL;
306 950 : PetscCheck(!same || !st->Psplit,PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"Support for changing the matrices while using a split preconditioner is not implemented yet");
307 950 : st->opready = PETSC_FALSE;
308 950 : if (!same) PetscCall(STMatIsSymmetricKnown(st,&st->asymm,&st->aherm));
309 950 : PetscFunctionReturn(PETSC_SUCCESS);
310 : }
311 :
312 : /*@
313 : STGetMatrix - Gets the matrices associated with the original eigensystem.
314 :
315 : Not Collective
316 :
317 : Input Parameters:
318 : + st - the spectral transformation context
319 : - k - the index of the requested matrix (starting in 0)
320 :
321 : Output Parameters:
322 : . A - the requested matrix
323 :
324 : Level: intermediate
325 :
326 : .seealso: STSetMatrices(), STGetNumMatrices()
327 : @*/
328 9803 : PetscErrorCode STGetMatrix(ST st,PetscInt k,Mat *A)
329 : {
330 9803 : PetscFunctionBegin;
331 9803 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
332 29409 : PetscValidLogicalCollectiveInt(st,k,2);
333 9803 : PetscAssertPointer(A,3);
334 9803 : STCheckMatrices(st,1);
335 9803 : PetscCheck(k>=0 && k<st->nmat,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"k must be between 0 and %" PetscInt_FMT,st->nmat-1);
336 9803 : PetscCheck(((PetscObject)st->A[k])->state==st->Astate[k],PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"Cannot retrieve original matrices (have been modified)");
337 9803 : *A = st->A[k];
338 9803 : PetscFunctionReturn(PETSC_SUCCESS);
339 : }
340 :
341 : /*@
342 : STGetMatrixTransformed - Gets the matrices associated with the transformed eigensystem.
343 :
344 : Not Collective
345 :
346 : Input Parameters:
347 : + st - the spectral transformation context
348 : - k - the index of the requested matrix (starting in 0)
349 :
350 : Output Parameters:
351 : . T - the requested matrix
352 :
353 : Level: developer
354 :
355 : .seealso: STGetMatrix(), STGetNumMatrices()
356 : @*/
357 224 : PetscErrorCode STGetMatrixTransformed(ST st,PetscInt k,Mat *T)
358 : {
359 224 : PetscFunctionBegin;
360 224 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
361 672 : PetscValidLogicalCollectiveInt(st,k,2);
362 224 : PetscAssertPointer(T,3);
363 224 : STCheckMatrices(st,1);
364 224 : PetscCheck(k>=0 && k<st->nmat,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"k must be between 0 and %" PetscInt_FMT,st->nmat-1);
365 224 : PetscCheck(st->T,PetscObjectComm((PetscObject)st),PETSC_ERR_POINTER,"There are no transformed matrices");
366 224 : *T = st->T[k];
367 224 : PetscFunctionReturn(PETSC_SUCCESS);
368 : }
369 :
370 : /*@
371 : STGetNumMatrices - Returns the number of matrices stored in the ST.
372 :
373 : Not Collective
374 :
375 : Input Parameter:
376 : . st - the spectral transformation context
377 :
378 : Output Parameters:
379 : . n - the number of matrices passed in STSetMatrices()
380 :
381 : Level: intermediate
382 :
383 : .seealso: STSetMatrices()
384 : @*/
385 6814 : PetscErrorCode STGetNumMatrices(ST st,PetscInt *n)
386 : {
387 6814 : PetscFunctionBegin;
388 6814 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
389 6814 : PetscAssertPointer(n,2);
390 6814 : *n = st->nmat;
391 6814 : PetscFunctionReturn(PETSC_SUCCESS);
392 : }
393 :
394 : /*@
395 : STResetMatrixState - Resets the stored state of the matrices in the ST.
396 :
397 : Logically Collective
398 :
399 : Input Parameter:
400 : . st - the spectral transformation context
401 :
402 : Note:
403 : This is useful in solvers where the user matrices are modified during
404 : the computation, as in nonlinear inverse iteration. The effect is that
405 : STGetMatrix() will retrieve the modified matrices as if they were
406 : the matrices originally provided by the user.
407 :
408 : Level: developer
409 :
410 : .seealso: STGetMatrix(), EPSPowerSetNonlinear()
411 : @*/
412 1099 : PetscErrorCode STResetMatrixState(ST st)
413 : {
414 1099 : PetscInt i;
415 :
416 1099 : PetscFunctionBegin;
417 1099 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
418 3297 : for (i=0;i<st->nmat;i++) st->Astate[i] = ((PetscObject)st->A[i])->state;
419 1099 : PetscFunctionReturn(PETSC_SUCCESS);
420 : }
421 :
422 : /*@
423 : STSetPreconditionerMat - Sets the matrix to be used to build the preconditioner.
424 :
425 : Collective
426 :
427 : Input Parameters:
428 : + st - the spectral transformation context
429 : - mat - the matrix that will be used in constructing the preconditioner
430 :
431 : Notes:
432 : This matrix will be passed to the internal KSP object (via the last argument
433 : of KSPSetOperators()) as the matrix to be used when constructing the preconditioner.
434 : If no matrix is set or mat is set to NULL, A-sigma*B will be used
435 : to build the preconditioner, being sigma the value set by STSetShift().
436 :
437 : More precisely, this is relevant for spectral transformations that represent
438 : a rational matrix function, and use a KSP object for the denominator, called
439 : K in the description of STGetOperator(). It includes also the STPRECOND case.
440 : If the user has a good approximation to matrix K that can be used to build a
441 : cheap preconditioner, it can be passed with this function. Note that it affects
442 : only the Pmat argument of KSPSetOperators(), not the Amat argument.
443 :
444 : If a preconditioner matrix is set, the default is to use an iterative KSP
445 : rather than a direct method.
446 :
447 : An alternative to pass an approximation of A-sigma*B with this function is
448 : to provide approximations of A and B via STSetSplitPreconditioner(). The
449 : difference is that when sigma changes the preconditioner is recomputed.
450 :
451 : Use NULL to remove a previously set matrix.
452 :
453 : Level: advanced
454 :
455 : .seealso: STGetPreconditionerMat(), STSetShift(), STGetOperator(), STSetSplitPreconditioner()
456 : @*/
457 21 : PetscErrorCode STSetPreconditionerMat(ST st,Mat mat)
458 : {
459 21 : PetscFunctionBegin;
460 21 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
461 21 : if (mat) {
462 20 : PetscValidHeaderSpecific(mat,MAT_CLASSID,2);
463 20 : PetscCheckSameComm(st,1,mat,2);
464 : }
465 21 : STCheckNotSeized(st,1);
466 21 : PetscCheck(!mat || !st->Psplit,PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"Cannot call both STSetPreconditionerMat and STSetSplitPreconditioner");
467 21 : if (mat) PetscCall(PetscObjectReference((PetscObject)mat));
468 21 : PetscCall(MatDestroy(&st->Pmat));
469 21 : st->Pmat = mat;
470 21 : st->Pmat_set = mat? PETSC_TRUE: PETSC_FALSE;
471 21 : st->state = ST_STATE_INITIAL;
472 21 : st->opready = PETSC_FALSE;
473 21 : PetscFunctionReturn(PETSC_SUCCESS);
474 : }
475 :
476 : /*@
477 : STGetPreconditionerMat - Returns the matrix previously set by STSetPreconditionerMat().
478 :
479 : Not Collective
480 :
481 : Input Parameter:
482 : . st - the spectral transformation context
483 :
484 : Output Parameter:
485 : . mat - the matrix that will be used in constructing the preconditioner or
486 : NULL if no matrix was set by STSetPreconditionerMat().
487 :
488 : Level: advanced
489 :
490 : .seealso: STSetPreconditionerMat()
491 : @*/
492 49 : PetscErrorCode STGetPreconditionerMat(ST st,Mat *mat)
493 : {
494 49 : PetscFunctionBegin;
495 49 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
496 49 : PetscAssertPointer(mat,2);
497 49 : *mat = st->Pmat_set? st->Pmat: NULL;
498 49 : PetscFunctionReturn(PETSC_SUCCESS);
499 : }
500 :
501 : /*@
502 : STSetSplitPreconditioner - Sets the matrices from which to build the preconditioner
503 : in split form.
504 :
505 : Collective
506 :
507 : Input Parameters:
508 : + st - the spectral transformation context
509 : . n - number of matrices
510 : . Psplit - array of matrices
511 : - strp - structure flag for Psplit matrices
512 :
513 : Notes:
514 : The number of matrices passed here must be the same as in STSetMatrices().
515 :
516 : For linear eigenproblems, the preconditioner matrix is computed as
517 : Pmat(sigma) = A0-sigma*B0, where A0 and B0 are approximations of A and B
518 : (the eigenproblem matrices) provided via the Psplit array in this function.
519 : Compared to STSetPreconditionerMat(), this function allows setting a preconditioner
520 : in a way that is independent of the shift sigma. Whenever the value of sigma
521 : changes the preconditioner is recomputed.
522 :
523 : Similarly, for polynomial eigenproblems the matrix for the preconditioner
524 : is expressed as Pmat(sigma) = sum_i Psplit_i*phi_i(sigma), for i=1,...,n, where
525 : the phi_i's are the polynomial basis functions.
526 :
527 : The structure flag provides information about the relative nonzero pattern of the
528 : Psplit_i matrices, in the same way as in STSetMatStructure().
529 :
530 : Use n=0 to reset a previously set split preconditioner.
531 :
532 : Level: advanced
533 :
534 : .seealso: STGetSplitPreconditionerTerm(), STGetSplitPreconditionerInfo(), STSetPreconditionerMat(), STSetMatrices(), STSetMatStructure()
535 : @*/
536 20 : PetscErrorCode STSetSplitPreconditioner(ST st,PetscInt n,Mat Psplit[],MatStructure strp)
537 : {
538 20 : PetscInt i,N=0,M,M0=0,mloc,nloc,mloc0=0;
539 :
540 20 : PetscFunctionBegin;
541 20 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
542 60 : PetscValidLogicalCollectiveInt(st,n,2);
543 20 : PetscCheck(n>=0,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"Negative value of n = %" PetscInt_FMT,n);
544 20 : PetscCheck(!n || !st->Pmat_set,PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"Cannot call both STSetPreconditionerMat and STSetSplitPreconditioner");
545 20 : PetscCheck(!n || !st->nmat || st->nmat==n,PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"The number of matrices must be the same as in STSetMatrices()");
546 20 : if (n) PetscAssertPointer(Psplit,3);
547 60 : PetscValidLogicalCollectiveEnum(st,strp,4);
548 20 : STCheckNotSeized(st,1);
549 :
550 64 : for (i=0;i<n;i++) {
551 44 : PetscValidHeaderSpecific(Psplit[i],MAT_CLASSID,3);
552 44 : PetscCheckSameComm(st,1,Psplit[i],3);
553 44 : PetscCall(MatGetSize(Psplit[i],&M,&N));
554 44 : PetscCall(MatGetLocalSize(Psplit[i],&mloc,&nloc));
555 44 : PetscCheck(M==N,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_WRONG,"Psplit[%" PetscInt_FMT "] is a non-square matrix (%" PetscInt_FMT " rows, %" PetscInt_FMT " cols)",i,M,N);
556 44 : PetscCheck(mloc==nloc,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_WRONG,"Psplit[%" PetscInt_FMT "] does not have equal row and column local sizes (%" PetscInt_FMT ", %" PetscInt_FMT ")",i,mloc,nloc);
557 44 : if (!i) { M0 = M; mloc0 = mloc; }
558 44 : PetscCheck(M==M0,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_INCOMP,"Dimensions of Psplit[%" PetscInt_FMT "] do not match with previous matrices (%" PetscInt_FMT ", %" PetscInt_FMT ")",i,M,M0);
559 44 : PetscCheck(mloc==mloc0,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_INCOMP,"Local dimensions of Psplit[%" PetscInt_FMT "] do not match with previous matrices (%" PetscInt_FMT ", %" PetscInt_FMT ")",i,mloc,mloc0);
560 44 : PetscCall(PetscObjectReference((PetscObject)Psplit[i]));
561 : }
562 :
563 20 : if (st->Psplit) PetscCall(MatDestroyMatrices(st->nsplit,&st->Psplit));
564 :
565 : /* allocate space and copy matrices */
566 20 : if (n) {
567 20 : PetscCall(PetscMalloc1(n,&st->Psplit));
568 64 : for (i=0;i<n;i++) st->Psplit[i] = Psplit[i];
569 : }
570 20 : st->nsplit = n;
571 20 : st->strp = strp;
572 20 : st->state = ST_STATE_INITIAL;
573 20 : PetscFunctionReturn(PETSC_SUCCESS);
574 : }
575 :
576 : /*@
577 : STGetSplitPreconditionerTerm - Gets the matrices associated with
578 : the split preconditioner.
579 :
580 : Not Collective
581 :
582 : Input Parameters:
583 : + st - the spectral transformation context
584 : - k - the index of the requested matrix (starting in 0)
585 :
586 : Output Parameter:
587 : . Psplit - the returned matrix
588 :
589 : Level: advanced
590 :
591 : .seealso: STSetSplitPreconditioner(), STGetSplitPreconditionerInfo()
592 : @*/
593 10 : PetscErrorCode STGetSplitPreconditionerTerm(ST st,PetscInt k,Mat *Psplit)
594 : {
595 10 : PetscFunctionBegin;
596 10 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
597 30 : PetscValidLogicalCollectiveInt(st,k,2);
598 10 : PetscAssertPointer(Psplit,3);
599 10 : PetscCheck(k>=0 && k<st->nsplit,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"k must be between 0 and %" PetscInt_FMT,st->nsplit-1);
600 10 : PetscCheck(st->Psplit,PetscObjectComm((PetscObject)st),PETSC_ERR_ORDER,"You have not called STSetSplitPreconditioner()");
601 10 : *Psplit = st->Psplit[k];
602 10 : PetscFunctionReturn(PETSC_SUCCESS);
603 : }
604 :
605 : /*@
606 : STGetSplitPreconditionerInfo - Returns the number of matrices of the split
607 : preconditioner, as well as the structure flag.
608 :
609 : Not Collective
610 :
611 : Input Parameter:
612 : . st - the spectral transformation context
613 :
614 : Output Parameters:
615 : + n - the number of matrices passed in STSetSplitPreconditioner()
616 : - strp - the matrix structure flag passed in STSetSplitPreconditioner()
617 :
618 : Level: advanced
619 :
620 : .seealso: STSetSplitPreconditioner(), STGetSplitPreconditionerTerm()
621 : @*/
622 86 : PetscErrorCode STGetSplitPreconditionerInfo(ST st,PetscInt *n,MatStructure *strp)
623 : {
624 86 : PetscFunctionBegin;
625 86 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
626 86 : if (n) *n = st->nsplit;
627 86 : if (strp) *strp = st->strp;
628 86 : PetscFunctionReturn(PETSC_SUCCESS);
629 : }
630 :
631 : /*@
632 : STSetShift - Sets the shift associated with the spectral transformation.
633 :
634 : Collective
635 :
636 : Input Parameters:
637 : + st - the spectral transformation context
638 : - shift - the value of the shift
639 :
640 : Notes:
641 : In some spectral transformations, changing the shift may have associated
642 : a lot of work, for example recomputing a factorization.
643 :
644 : This function is normally not directly called by users, since the shift is
645 : indirectly set by EPSSetTarget().
646 :
647 : Level: intermediate
648 :
649 : .seealso: EPSSetTarget(), STGetShift(), STSetDefaultShift()
650 : @*/
651 489 : PetscErrorCode STSetShift(ST st,PetscScalar shift)
652 : {
653 489 : PetscFunctionBegin;
654 489 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
655 489 : PetscValidType(st,1);
656 1467 : PetscValidLogicalCollectiveScalar(st,shift,2);
657 489 : if (st->sigma != shift) {
658 471 : STCheckNotSeized(st,1);
659 471 : if (st->state==ST_STATE_SETUP) PetscTryTypeMethod(st,setshift,shift);
660 471 : st->sigma = shift;
661 : }
662 489 : st->sigma_set = PETSC_TRUE;
663 489 : PetscFunctionReturn(PETSC_SUCCESS);
664 : }
665 :
666 : /*@
667 : STGetShift - Gets the shift associated with the spectral transformation.
668 :
669 : Not Collective
670 :
671 : Input Parameter:
672 : . st - the spectral transformation context
673 :
674 : Output Parameter:
675 : . shift - the value of the shift
676 :
677 : Level: intermediate
678 :
679 : .seealso: STSetShift()
680 : @*/
681 2171 : PetscErrorCode STGetShift(ST st,PetscScalar* shift)
682 : {
683 2171 : PetscFunctionBegin;
684 2171 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
685 2171 : PetscAssertPointer(shift,2);
686 2171 : *shift = st->sigma;
687 2171 : PetscFunctionReturn(PETSC_SUCCESS);
688 : }
689 :
690 : /*@
691 : STSetDefaultShift - Sets the value of the shift that should be employed if
692 : the user did not specify one.
693 :
694 : Logically Collective
695 :
696 : Input Parameters:
697 : + st - the spectral transformation context
698 : - defaultshift - the default value of the shift
699 :
700 : Level: developer
701 :
702 : .seealso: STSetShift()
703 : @*/
704 309 : PetscErrorCode STSetDefaultShift(ST st,PetscScalar defaultshift)
705 : {
706 309 : PetscFunctionBegin;
707 309 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
708 927 : PetscValidLogicalCollectiveScalar(st,defaultshift,2);
709 309 : if (st->defsigma != defaultshift) {
710 192 : st->defsigma = defaultshift;
711 192 : st->state = ST_STATE_INITIAL;
712 192 : st->opready = PETSC_FALSE;
713 : }
714 309 : PetscFunctionReturn(PETSC_SUCCESS);
715 : }
716 :
717 : /*@
718 : STScaleShift - Multiply the shift with a given factor.
719 :
720 : Logically Collective
721 :
722 : Input Parameters:
723 : + st - the spectral transformation context
724 : - factor - the scaling factor
725 :
726 : Note:
727 : This function does not update the transformation matrices, as opposed to
728 : STSetShift().
729 :
730 : Level: developer
731 :
732 : .seealso: STSetShift()
733 : @*/
734 210 : PetscErrorCode STScaleShift(ST st,PetscScalar factor)
735 : {
736 210 : PetscFunctionBegin;
737 210 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
738 630 : PetscValidLogicalCollectiveScalar(st,factor,2);
739 210 : st->sigma *= factor;
740 210 : PetscFunctionReturn(PETSC_SUCCESS);
741 : }
742 :
743 : /*@
744 : STSetBalanceMatrix - Sets the diagonal matrix to be used for balancing.
745 :
746 : Collective
747 :
748 : Input Parameters:
749 : + st - the spectral transformation context
750 : - D - the diagonal matrix (represented as a vector)
751 :
752 : Notes:
753 : If this matrix is set, STApply will effectively apply D*OP*D^{-1}. Use NULL
754 : to reset a previously passed D.
755 :
756 : Balancing is usually set via EPSSetBalance, but the advanced user may use
757 : this function to bypass the usual balancing methods.
758 :
759 : Level: developer
760 :
761 : .seealso: EPSSetBalance(), STApply(), STGetBalanceMatrix()
762 : @*/
763 900 : PetscErrorCode STSetBalanceMatrix(ST st,Vec D)
764 : {
765 900 : PetscFunctionBegin;
766 900 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
767 900 : if (st->D == D) PetscFunctionReturn(PETSC_SUCCESS);
768 13 : STCheckNotSeized(st,1);
769 13 : if (D) {
770 13 : PetscValidHeaderSpecific(D,VEC_CLASSID,2);
771 13 : PetscCheckSameComm(st,1,D,2);
772 13 : PetscCall(PetscObjectReference((PetscObject)D));
773 : }
774 13 : PetscCall(VecDestroy(&st->D));
775 13 : st->D = D;
776 13 : st->state = ST_STATE_INITIAL;
777 13 : st->opready = PETSC_FALSE;
778 13 : PetscFunctionReturn(PETSC_SUCCESS);
779 : }
780 :
781 : /*@
782 : STGetBalanceMatrix - Gets the balance matrix used by the spectral transformation.
783 :
784 : Not Collective
785 :
786 : Input Parameter:
787 : . st - the spectral transformation context
788 :
789 : Output Parameter:
790 : . D - the diagonal matrix (represented as a vector)
791 :
792 : Note:
793 : If the matrix was not set, a null pointer will be returned.
794 :
795 : Level: developer
796 :
797 : .seealso: STSetBalanceMatrix()
798 : @*/
799 0 : PetscErrorCode STGetBalanceMatrix(ST st,Vec *D)
800 : {
801 0 : PetscFunctionBegin;
802 0 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
803 0 : PetscAssertPointer(D,2);
804 0 : *D = st->D;
805 0 : PetscFunctionReturn(PETSC_SUCCESS);
806 : }
807 :
808 : /*@
809 : STMatCreateVecs - Get vector(s) compatible with the ST matrices.
810 :
811 : Collective
812 :
813 : Input Parameter:
814 : . st - the spectral transformation context
815 :
816 : Output Parameters:
817 : + right - (optional) vector that the matrix can be multiplied against
818 : - left - (optional) vector that the matrix vector product can be stored in
819 :
820 : Level: developer
821 :
822 : .seealso: STMatCreateVecsEmpty()
823 : @*/
824 373 : PetscErrorCode STMatCreateVecs(ST st,Vec *right,Vec *left)
825 : {
826 373 : PetscFunctionBegin;
827 373 : STCheckMatrices(st,1);
828 373 : PetscCall(MatCreateVecs(st->A[0],right,left));
829 373 : PetscFunctionReturn(PETSC_SUCCESS);
830 : }
831 :
832 : /*@
833 : STMatCreateVecsEmpty - Get vector(s) compatible with the ST matrices, i.e. with the same
834 : parallel layout, but without internal array.
835 :
836 : Collective
837 :
838 : Input Parameter:
839 : . st - the spectral transformation context
840 :
841 : Output Parameters:
842 : + right - (optional) vector that the matrix can be multiplied against
843 : - left - (optional) vector that the matrix vector product can be stored in
844 :
845 : Level: developer
846 :
847 : .seealso: STMatCreateVecs(), MatCreateVecsEmpty()
848 : @*/
849 854 : PetscErrorCode STMatCreateVecsEmpty(ST st,Vec *right,Vec *left)
850 : {
851 854 : PetscFunctionBegin;
852 854 : STCheckMatrices(st,1);
853 854 : PetscCall(MatCreateVecsEmpty(st->A[0],right,left));
854 854 : PetscFunctionReturn(PETSC_SUCCESS);
855 : }
856 :
857 : /*@
858 : STMatGetSize - Returns the number of rows and columns of the ST matrices.
859 :
860 : Not Collective
861 :
862 : Input Parameter:
863 : . st - the spectral transformation context
864 :
865 : Output Parameters:
866 : + m - the number of global rows
867 : - n - the number of global columns
868 :
869 : Level: developer
870 :
871 : .seealso: STMatGetLocalSize()
872 : @*/
873 887 : PetscErrorCode STMatGetSize(ST st,PetscInt *m,PetscInt *n)
874 : {
875 887 : PetscFunctionBegin;
876 887 : STCheckMatrices(st,1);
877 887 : PetscCall(MatGetSize(st->A[0],m,n));
878 887 : PetscFunctionReturn(PETSC_SUCCESS);
879 : }
880 :
881 : /*@
882 : STMatGetLocalSize - Returns the number of local rows and columns of the ST matrices.
883 :
884 : Not Collective
885 :
886 : Input Parameter:
887 : . st - the spectral transformation context
888 :
889 : Output Parameters:
890 : + m - the number of local rows
891 : - n - the number of local columns
892 :
893 : Level: developer
894 :
895 : .seealso: STMatGetSize()
896 : @*/
897 887 : PetscErrorCode STMatGetLocalSize(ST st,PetscInt *m,PetscInt *n)
898 : {
899 887 : PetscFunctionBegin;
900 887 : STCheckMatrices(st,1);
901 887 : PetscCall(MatGetLocalSize(st->A[0],m,n));
902 887 : PetscFunctionReturn(PETSC_SUCCESS);
903 : }
904 :
905 : /*@
906 : STSetOptionsPrefix - Sets the prefix used for searching for all
907 : ST options in the database.
908 :
909 : Logically Collective
910 :
911 : Input Parameters:
912 : + st - the spectral transformation context
913 : - prefix - the prefix string to prepend to all ST option requests
914 :
915 : Notes:
916 : A hyphen (-) must NOT be given at the beginning of the prefix name.
917 : The first character of all runtime options is AUTOMATICALLY the
918 : hyphen.
919 :
920 : Level: advanced
921 :
922 : .seealso: STAppendOptionsPrefix(), STGetOptionsPrefix()
923 : @*/
924 225 : PetscErrorCode STSetOptionsPrefix(ST st,const char *prefix)
925 : {
926 225 : PetscFunctionBegin;
927 225 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
928 225 : if (!st->ksp) PetscCall(STGetKSP(st,&st->ksp));
929 225 : PetscCall(KSPSetOptionsPrefix(st->ksp,prefix));
930 225 : PetscCall(KSPAppendOptionsPrefix(st->ksp,"st_"));
931 225 : PetscCall(PetscObjectSetOptionsPrefix((PetscObject)st,prefix));
932 225 : PetscFunctionReturn(PETSC_SUCCESS);
933 : }
934 :
935 : /*@
936 : STAppendOptionsPrefix - Appends to the prefix used for searching for all
937 : ST options in the database.
938 :
939 : Logically Collective
940 :
941 : Input Parameters:
942 : + st - the spectral transformation context
943 : - prefix - the prefix string to prepend to all ST option requests
944 :
945 : Notes:
946 : A hyphen (-) must NOT be given at the beginning of the prefix name.
947 : The first character of all runtime options is AUTOMATICALLY the
948 : hyphen.
949 :
950 : Level: advanced
951 :
952 : .seealso: STSetOptionsPrefix(), STGetOptionsPrefix()
953 : @*/
954 185 : PetscErrorCode STAppendOptionsPrefix(ST st,const char *prefix)
955 : {
956 185 : PetscFunctionBegin;
957 185 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
958 185 : PetscCall(PetscObjectAppendOptionsPrefix((PetscObject)st,prefix));
959 185 : if (!st->ksp) PetscCall(STGetKSP(st,&st->ksp));
960 185 : PetscCall(KSPSetOptionsPrefix(st->ksp,((PetscObject)st)->prefix));
961 185 : PetscCall(KSPAppendOptionsPrefix(st->ksp,"st_"));
962 185 : PetscFunctionReturn(PETSC_SUCCESS);
963 : }
964 :
965 : /*@
966 : STGetOptionsPrefix - Gets the prefix used for searching for all
967 : ST options in the database.
968 :
969 : Not Collective
970 :
971 : Input Parameters:
972 : . st - the spectral transformation context
973 :
974 : Output Parameters:
975 : . prefix - pointer to the prefix string used, is returned
976 :
977 : Note:
978 : On the Fortran side, the user should pass in a string 'prefix' of
979 : sufficient length to hold the prefix.
980 :
981 : Level: advanced
982 :
983 : .seealso: STSetOptionsPrefix(), STAppendOptionsPrefix()
984 : @*/
985 0 : PetscErrorCode STGetOptionsPrefix(ST st,const char *prefix[])
986 : {
987 0 : PetscFunctionBegin;
988 0 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
989 0 : PetscAssertPointer(prefix,2);
990 0 : PetscCall(PetscObjectGetOptionsPrefix((PetscObject)st,prefix));
991 0 : PetscFunctionReturn(PETSC_SUCCESS);
992 : }
993 :
994 : /*@
995 : STView - Prints the ST data structure.
996 :
997 : Collective
998 :
999 : Input Parameters:
1000 : + st - the ST context
1001 : - viewer - optional visualization context
1002 :
1003 : Note:
1004 : The available visualization contexts include
1005 : + PETSC_VIEWER_STDOUT_SELF - standard output (default)
1006 : - PETSC_VIEWER_STDOUT_WORLD - synchronized standard
1007 : output where only the first processor opens
1008 : the file. All other processors send their
1009 : data to the first processor to print.
1010 :
1011 : The user can open an alternative visualization contexts with
1012 : PetscViewerASCIIOpen() (output to a specified file).
1013 :
1014 : Level: beginner
1015 :
1016 : .seealso: EPSView()
1017 : @*/
1018 13 : PetscErrorCode STView(ST st,PetscViewer viewer)
1019 : {
1020 13 : STType cstr;
1021 13 : char str[50];
1022 13 : PetscBool isascii,isstring;
1023 :
1024 13 : PetscFunctionBegin;
1025 13 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
1026 13 : if (!viewer) PetscCall(PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)st),&viewer));
1027 13 : PetscValidHeaderSpecific(viewer,PETSC_VIEWER_CLASSID,2);
1028 13 : PetscCheckSameComm(st,1,viewer,2);
1029 :
1030 13 : PetscCall(PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii));
1031 13 : PetscCall(PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERSTRING,&isstring));
1032 13 : if (isascii) {
1033 13 : PetscCall(PetscObjectPrintClassNamePrefixType((PetscObject)st,viewer));
1034 13 : PetscCall(PetscViewerASCIIPushTab(viewer));
1035 13 : PetscTryTypeMethod(st,view,viewer);
1036 13 : PetscCall(PetscViewerASCIIPopTab(viewer));
1037 13 : PetscCall(SlepcSNPrintfScalar(str,sizeof(str),st->sigma,PETSC_FALSE));
1038 13 : PetscCall(PetscViewerASCIIPrintf(viewer," shift: %s\n",str));
1039 13 : PetscCall(PetscViewerASCIIPrintf(viewer," number of matrices: %" PetscInt_FMT "\n",st->nmat));
1040 13 : switch (st->matmode) {
1041 : case ST_MATMODE_COPY:
1042 : break;
1043 0 : case ST_MATMODE_INPLACE:
1044 0 : PetscCall(PetscViewerASCIIPrintf(viewer," shifting the matrix and unshifting at exit\n"));
1045 : break;
1046 1 : case ST_MATMODE_SHELL:
1047 1 : PetscCall(PetscViewerASCIIPrintf(viewer," using a shell matrix\n"));
1048 : break;
1049 : }
1050 13 : if (st->nmat>1 && st->matmode != ST_MATMODE_SHELL) PetscCall(PetscViewerASCIIPrintf(viewer," nonzero pattern of the matrices: %s\n",MatStructures[st->str]));
1051 13 : if (st->Psplit) PetscCall(PetscViewerASCIIPrintf(viewer," using split preconditioner matrices with %s\n",MatStructures[st->strp]));
1052 13 : if (st->transform && st->nmat>2) PetscCall(PetscViewerASCIIPrintf(viewer," computing transformed matrices\n"));
1053 13 : if (st->structured) PetscCall(PetscViewerASCIIPrintf(viewer," exploiting structure in the application of the operator\n"));
1054 0 : } else if (isstring) {
1055 0 : PetscCall(STGetType(st,&cstr));
1056 0 : PetscCall(PetscViewerStringSPrintf(viewer," %-7.7s",cstr));
1057 0 : PetscTryTypeMethod(st,view,viewer);
1058 : }
1059 13 : if (st->usesksp) {
1060 7 : if (!st->ksp) PetscCall(STGetKSP(st,&st->ksp));
1061 7 : PetscCall(PetscViewerASCIIPushTab(viewer));
1062 7 : PetscCall(KSPView(st->ksp,viewer));
1063 7 : PetscCall(PetscViewerASCIIPopTab(viewer));
1064 : }
1065 13 : PetscFunctionReturn(PETSC_SUCCESS);
1066 : }
1067 :
1068 : /*@
1069 : STViewFromOptions - View from options
1070 :
1071 : Collective
1072 :
1073 : Input Parameters:
1074 : + st - the spectral transformation context
1075 : . obj - optional object
1076 : - name - command line option
1077 :
1078 : Level: intermediate
1079 :
1080 : .seealso: STView(), STCreate()
1081 : @*/
1082 0 : PetscErrorCode STViewFromOptions(ST st,PetscObject obj,const char name[])
1083 : {
1084 0 : PetscFunctionBegin;
1085 0 : PetscValidHeaderSpecific(st,ST_CLASSID,1);
1086 0 : PetscCall(PetscObjectViewFromOptions((PetscObject)st,obj,name));
1087 0 : PetscFunctionReturn(PETSC_SUCCESS);
1088 : }
1089 :
1090 : /*@C
1091 : STRegister - Adds a method to the spectral transformation package.
1092 :
1093 : Not Collective
1094 :
1095 : Input Parameters:
1096 : + name - name of a new user-defined transformation
1097 : - function - routine to create method context
1098 :
1099 : Notes:
1100 : STRegister() may be called multiple times to add several user-defined
1101 : spectral transformations.
1102 :
1103 : Example Usage:
1104 : .vb
1105 : STRegister("my_transform",MyTransformCreate);
1106 : .ve
1107 :
1108 : Then, your spectral transform can be chosen with the procedural interface via
1109 : $ STSetType(st,"my_transform")
1110 : or at runtime via the option
1111 : $ -st_type my_transform
1112 :
1113 : Level: advanced
1114 :
1115 : .seealso: STRegisterAll()
1116 : @*/
1117 4434 : PetscErrorCode STRegister(const char *name,PetscErrorCode (*function)(ST))
1118 : {
1119 4434 : PetscFunctionBegin;
1120 4434 : PetscCall(STInitializePackage());
1121 4434 : PetscCall(PetscFunctionListAdd(&STList,name,function));
1122 4434 : PetscFunctionReturn(PETSC_SUCCESS);
1123 : }
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