Actual source code: svdmat.c
1: /*
2: SVD routines for accessing the problem matrix.
4: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
5: SLEPc - Scalable Library for Eigenvalue Problem Computations
6: Copyright (c) 2002-2009, Universidad Politecnica de Valencia, Spain
8: This file is part of SLEPc.
9:
10: SLEPc is free software: you can redistribute it and/or modify it under the
11: terms of version 3 of the GNU Lesser General Public License as published by
12: the Free Software Foundation.
14: SLEPc is distributed in the hope that it will be useful, but WITHOUT ANY
15: WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16: FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
17: more details.
19: You should have received a copy of the GNU Lesser General Public License
20: along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
21: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
22: */
24: #include private/svdimpl.h
28: PetscErrorCode SVDMatMult(SVD svd,PetscTruth trans,Vec x,Vec y)
29: {
36: svd->matvecs++;
37: if (trans) {
38: if (svd->AT) {
39: MatMult(svd->AT,x,y);
40: } else {
41: MatMultTranspose(svd->A,x,y);
42: }
43: } else {
44: if (svd->A) {
45: MatMult(svd->A,x,y);
46: } else {
47: MatMultTranspose(svd->AT,x,y);
48: }
49: }
50: return(0);
51: }
55: PetscErrorCode SVDMatGetVecs(SVD svd,Vec *x,Vec *y)
56: {
61: if (svd->A) {
62: MatGetVecs(svd->A,x,y);
63: } else {
64: MatGetVecs(svd->AT,y,x);
65: }
66: return(0);
67: }
71: PetscErrorCode SVDMatGetSize(SVD svd,PetscInt *m,PetscInt *n)
72: {
77: if (svd->A) {
78: MatGetSize(svd->A,m,n);
79: } else {
80: MatGetSize(svd->AT,n,m);
81: }
82: return(0);
83: }
87: PetscErrorCode SVDMatGetLocalSize(SVD svd,PetscInt *m,PetscInt *n)
88: {
93: if (svd->A) {
94: MatGetLocalSize(svd->A,m,n);
95: } else {
96: MatGetLocalSize(svd->AT,n,m);
97: }
98: return(0);
99: }