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

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Revision 633 - (show annotations)
Thu Mar 23 05:37:00 2006 UTC (13 years, 5 months ago) by dhawcroft
File MIME type: text/plain
File size: 3599 byte(s)


1 /* $Id$ */
2
3
4 /*
5 ********************************************************************************
6 * Copyright 2006 by ACcESS MNRF *
7 * *
8 * http://www.access.edu.au *
9 * Primary Business: Queensland, Australia *
10 * Licensed under the Open Software License version 3.0 *
11 * http://www.opensource.org/licenses/osl-3.0.php *
12 ********************************************************************************
13 */
14
15 /**************************************************************/
16
17 /* Paso: SystemMatrix */
18
19 /**************************************************************/
20
21 /* Copyrights by ACcESS Australia 2003, 2004,2005 */
22 /* Author: gross@access.edu.au */
23
24 /**************************************************************/
25
26 #include "Paso.h"
27 #include "SystemMatrix.h"
28 #include "PasoUtil.h"
29
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_SystemMatrix* Paso_SystemMatrix_getSubmatrix(Paso_SystemMatrix* A,int n_row_sub,index_t* row_list,index_t* new_col_index){
42 Paso_SystemMatrixPattern* sub_pattern=NULL;
43 Paso_SystemMatrix* out=NULL;
44 index_t index_offset=(A->type & MATRIX_FORMAT_OFFSET1 ? 1:0);
45 Paso_resetError();
46 int i,k,tmp,m,subpattern_row;
47 int type=A->type;
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_SystemMatrixPattern_getSubpattern(A->pattern,n_row_sub,row_list,new_col_index);
52 if (Paso_noError()) {
53 /* create the return object */
54 out=Paso_SystemMatrix_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 for (m=out->pattern->ptr[i]-index_offset;m<out->pattern->ptr[i+1]-index_offset;++m) {
63 if (out->pattern->index[m]==tmp+index_offset) {
64 Paso_copyDouble(A->block_size,&(A->val[k*A->block_size]),&(out->val[m*A->block_size]));
65 break;
66 }
67 }
68 }
69 }
70 }
71 }
72 }
73 Paso_SystemMatrixPattern_dealloc(sub_pattern);
74 }
75 return out;
76 }
77 /*
78 * $Log$
79 * Revision 1.2 2005/09/15 03:44:39 jgs
80 * Merge of development branch dev-02 back to main trunk on 2005-09-15
81 *
82 * Revision 1.1.2.1 2005/09/05 06:29:48 gross
83 * These files have been extracted from finley to define a stand alone libray for iterative
84 * linear solvers on the ALTIX. main entry through Paso_solve. this version compiles but
85 * has not been tested yet.
86 *
87 *
88 */

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