Actual source code: svdelemen.cxx

slepc-3.17.2 2022-08-09
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

  6:    This file is part of SLEPc.
  7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
  8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  9: */
 10: /*
 11:    This file implements a wrapper to the Elemental SVD solver
 12: */

 14: #include <slepc/private/svdimpl.h>
 15: #include <petsc/private/petscelemental.h>

 17: typedef struct {
 18:   Mat Ae;        /* converted matrix */
 19: } SVD_Elemental;

 21: PetscErrorCode SVDSetUp_Elemental(SVD svd)
 22: {
 23:   SVD_Elemental  *ctx = (SVD_Elemental*)svd->data;
 24:   PetscInt       M,N;

 26:   SVDCheckStandard(svd);
 27:   MatGetSize(svd->A,&M,&N);
 29:   svd->ncv = N;
 30:   if (svd->mpd!=PETSC_DEFAULT) PetscInfo(svd,"Warning: parameter mpd ignored\n");
 31:   if (svd->max_it==PETSC_DEFAULT) svd->max_it = 1;
 32:   svd->leftbasis = PETSC_TRUE;
 33:   SVDCheckUnsupported(svd,SVD_FEATURE_STOPPING);
 34:   SVDAllocateSolution(svd,0);

 36:   /* convert matrix */
 37:   MatDestroy(&ctx->Ae);
 38:   MatConvert(svd->OP,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Ae);
 39:   PetscFunctionReturn(0);
 40: }

 42: PetscErrorCode SVDSolve_Elemental(SVD svd)
 43: {
 44:   SVD_Elemental  *ctx = (SVD_Elemental*)svd->data;
 45:   Mat            A = ctx->Ae,Z,Q,U,V;
 46:   Mat_Elemental  *a = (Mat_Elemental*)A->data,*q,*z;
 47:   PetscInt       i,rrank,ridx,erow;

 49:   El::DistMatrix<PetscReal,El::STAR,El::VC> sigma(*a->grid);
 50:   MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&Z);
 51:   MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&Q);
 52:   z = (Mat_Elemental*)Z->data;
 53:   q = (Mat_Elemental*)Q->data;

 55:   El::SVD(*a->emat,*z->emat,sigma,*q->emat);

 57:   for (i=0;i<svd->ncv;i++) {
 58:     P2RO(A,1,i,&rrank,&ridx);
 59:     RO2E(A,1,rrank,ridx,&erow);
 60:     svd->sigma[i] = sigma.Get(erow,0);
 61:   }
 62:   BVGetMat(svd->U,&U);
 63:   MatConvert(Z,MATDENSE,MAT_REUSE_MATRIX,&U);
 64:   BVRestoreMat(svd->U,&U);
 65:   MatDestroy(&Z);
 66:   BVGetMat(svd->V,&V);
 67:   MatConvert(Q,MATDENSE,MAT_REUSE_MATRIX,&V);
 68:   BVRestoreMat(svd->V,&V);
 69:   MatDestroy(&Q);

 71:   svd->nconv  = svd->ncv;
 72:   svd->its    = 1;
 73:   svd->reason = SVD_CONVERGED_TOL;
 74:   PetscFunctionReturn(0);
 75: }

 77: PetscErrorCode SVDDestroy_Elemental(SVD svd)
 78: {
 79:   PetscFree(svd->data);
 80:   PetscFunctionReturn(0);
 81: }

 83: PetscErrorCode SVDReset_Elemental(SVD svd)
 84: {
 85:   SVD_Elemental  *ctx = (SVD_Elemental*)svd->data;

 87:   MatDestroy(&ctx->Ae);
 88:   PetscFunctionReturn(0);
 89: }

 91: SLEPC_EXTERN PetscErrorCode SVDCreate_Elemental(SVD svd)
 92: {
 93:   SVD_Elemental  *ctx;

 95:   PetscNewLog(svd,&ctx);
 96:   svd->data = (void*)ctx;

 98:   svd->ops->solve          = SVDSolve_Elemental;
 99:   svd->ops->setup          = SVDSetUp_Elemental;
100:   svd->ops->destroy        = SVDDestroy_Elemental;
101:   svd->ops->reset          = SVDReset_Elemental;
102:   PetscFunctionReturn(0);
103: }