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

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Revision 415 - (hide annotations)
Wed Jan 4 05:37:33 2006 UTC (14 years, 6 months ago) by gross
File MIME type: text/plain
File size: 2949 byte(s)
a better way of representing the matrix format type is introduced. this is needed for the Paradiso and UMFPACK interface
1 jgs 150 /* $Id$ */
2    
3     /**************************************************************/
4    
5     /* Paso: SystemMatrix */
6    
7     /**************************************************************/
8    
9     /* Copyrights by ACcESS Australia 2003, 2004,2005 */
10     /* Author: gross@access.edu.au */
11    
12     /**************************************************************/
13    
14     #include "Paso.h"
15     #include "SystemMatrix.h"
16     #include "Util.h"
17    
18    
19     /**************************************************************
20    
21     returns the submatrix of A where rows are gathered by index row_list
22     and columns are selected by non-negative values of new_col_index.
23     if new_col_index[i]>-1 new_col_index[i] gives the column of i in
24     the returned submatrix
25    
26     */
27    
28    
29     Paso_SystemMatrix* Paso_SystemMatrix_getSubmatrix(Paso_SystemMatrix* A,int n_row_sub,index_t* row_list,index_t* new_col_index){
30     Paso_SystemMatrixPattern* sub_pattern=NULL;
31     Paso_SystemMatrix* out=NULL;
32 gross 415 index_t index_offset=(A->type & MATRIX_FORMAT_OFFSET1 ? 1:0);
33 jgs 150 Paso_resetError();
34     int i,k,tmp,m,subpattern_row;
35     int type=A->type;
36 gross 415 if (A->type & MATRIX_FORMAT_CSC) {
37 jgs 150 Paso_setError(TYPE_ERROR,"gathering submatrices supports CSR matrix format only.");
38     } else {
39     sub_pattern=Paso_SystemMatrixPattern_getSubpattern(A->pattern,n_row_sub,row_list,new_col_index);
40     if (Paso_noError()) {
41     /* create the return object */
42     out=Paso_SystemMatrix_alloc(type,sub_pattern,A->row_block_size,A->col_block_size);
43     if (Paso_noError()) {
44     #pragma omp parallel for private(i,k,m,subpattern_row,tmp) schedule(static)
45     for (i=0;i<n_row_sub;++i) {
46     subpattern_row=row_list[i];
47 gross 415 for (k=A->pattern->ptr[subpattern_row]-index_offset;k<A->pattern->ptr[subpattern_row+1]-index_offset;++k) {
48     tmp=new_col_index[A->pattern->index[k]-index_offset];
49 jgs 150 if (tmp>-1) {
50 gross 415 for (m=out->pattern->ptr[i]-index_offset;m<out->pattern->ptr[i+1]-index_offset;++m) {
51     if (out->pattern->index[m]==tmp+index_offset) {
52 jgs 150 Paso_copyDouble(A->block_size,&(A->val[k*A->block_size]),&(out->val[m*A->block_size]));
53     break;
54     }
55     }
56     }
57     }
58     }
59     }
60     }
61     Paso_SystemMatrixPattern_dealloc(sub_pattern);
62     }
63     return out;
64     }
65     /*
66     * $Log$
67     * Revision 1.2 2005/09/15 03:44:39 jgs
68     * Merge of development branch dev-02 back to main trunk on 2005-09-15
69     *
70     * Revision 1.1.2.1 2005/09/05 06:29:48 gross
71     * These files have been extracted from finley to define a stand alone libray for iterative
72     * linear solvers on the ALTIX. main entry through Paso_solve. this version compiles but
73     * has not been tested yet.
74     *
75     *
76     */

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