/[escript]/trunk/paso/src/SparseMatrix_getSubmatrix.c
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Contents of /trunk/paso/src/SparseMatrix_getSubmatrix.c

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Revision 1388 - (show annotations)
Fri Jan 11 07:45:58 2008 UTC (11 years, 7 months ago) by trankine
File MIME type: text/plain
File size: 3076 byte(s)
And get the *(&(*&(* name right
1
2 /* $Id: SparseMatrix_getSubmatrix.c 1306 2007-09-18 05:51:09Z ksteube $ */
3
4 /*******************************************************
5 *
6 * Copyright 2003-2007 by ACceSS MNRF
7 * Copyright 2007 by University of Queensland
8 *
9 * http://esscc.uq.edu.au
10 * Primary Business: Queensland, Australia
11 * Licensed under the Open Software License version 3.0
12 * http://www.opensource.org/licenses/osl-3.0.php
13 *
14 *******************************************************/
15
16 /**************************************************************/
17
18 /* Paso: SparseMatrix */
19
20 /**************************************************************/
21
22 /* Copyrights by ACcESS Australia 2003, 2004,2005 */
23 /* Author: gross@access.edu.au */
24
25 /**************************************************************/
26
27 #include "Paso.h"
28 #include "SparseMatrix.h"
29 #include "PasoUtil.h"
30
31 /**************************************************************
32
33 returns the submatrix of A where rows are gathered by index row_list
34 and columns are selected by non-negative values of new_col_index.
35 if new_col_index[i]>-1 new_col_index[i] gives the column of i in
36 the returned submatrix
37
38 */
39
40
41 Paso_SparseMatrix* Paso_SparseMatrix_getSubmatrix(Paso_SparseMatrix* A,int n_row_sub,int n_col_sub, index_t* row_list,index_t* new_col_index){
42 Paso_Pattern* sub_pattern=NULL;
43 Paso_SparseMatrix* out=NULL;
44 index_t index_offset=(A->type & MATRIX_FORMAT_OFFSET1 ? 1:0);
45 int i,k,tmp,m,subpattern_row;
46 int type=A->type;
47 Paso_resetError();
48 if (A->type & MATRIX_FORMAT_CSC) {
49 Paso_setError(TYPE_ERROR,"gathering submatrices supports CSR matrix format only.");
50 } else {
51 sub_pattern=Paso_Pattern_getSubpattern(A->pattern,n_row_sub,n_col_sub,row_list,new_col_index);
52 if (Paso_noError()) {
53 /* create the return object */
54 out=Paso_SparseMatrix_alloc(type,sub_pattern,A->row_block_size,A->col_block_size);
55 if (Paso_noError()) {
56 #pragma omp parallel for private(i,k,m,subpattern_row,tmp) schedule(static)
57 for (i=0;i<n_row_sub;++i) {
58 subpattern_row=row_list[i];
59 for (k=A->pattern->ptr[subpattern_row]-index_offset;k<A->pattern->ptr[subpattern_row+1]-index_offset;++k) {
60 tmp=new_col_index[A->pattern->index[k]-index_offset];
61 if (tmp>-1) {
62 #pragma ivdep
63 for (m=out->pattern->ptr[i]-index_offset;m<out->pattern->ptr[i+1]-index_offset;++m) {
64 if (out->pattern->index[m]==tmp+index_offset) {
65 Paso_copyDouble(A->block_size,&(A->val[k*A->block_size]),&(out->val[m*A->block_size]));
66 break;
67 }
68 }
69 }
70 }
71 }
72 }
73 }
74 Paso_Pattern_free(sub_pattern);
75 }
76 return out;
77 }

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