/[escript]/trunk/paso/src/SparseMatrix_getSubmatrix.cpp
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Annotation of /trunk/paso/src/SparseMatrix_getSubmatrix.cpp

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Revision 1811 - (hide annotations)
Thu Sep 25 23:11:13 2008 UTC (11 years ago) by ksteube
Original Path: trunk/paso/src/SparseMatrix_getSubmatrix.c
File MIME type: text/plain
File size: 2982 byte(s)
Copyright updated in all files

1 ksteube 1315
2     /*******************************************************
3 ksteube 1811 *
4     * Copyright (c) 2003-2008 by University of Queensland
5     * Earth Systems Science Computational Center (ESSCC)
6     * http://www.uq.edu.au/esscc
7     *
8     * Primary Business: Queensland, Australia
9     * Licensed under the Open Software License version 3.0
10     * http://www.opensource.org/licenses/osl-3.0.php
11     *
12     *******************************************************/
13 ksteube 1315
14 ksteube 1811
15 ksteube 1315 /**************************************************************/
16    
17     /* Paso: SparseMatrix */
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 "SparseMatrix.h"
28     #include "PasoUtil.h"
29    
30     /**************************************************************
31    
32     returns the submatrix of A where rows are gathered by index row_list
33     and columns are selected by non-negative values of new_col_index.
34     if new_col_index[i]>-1 new_col_index[i] gives the column of i in
35     the returned submatrix
36    
37     */
38    
39    
40     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){
41     Paso_Pattern* sub_pattern=NULL;
42     Paso_SparseMatrix* out=NULL;
43     index_t index_offset=(A->type & MATRIX_FORMAT_OFFSET1 ? 1:0);
44     int i,k,tmp,m,subpattern_row;
45     int type=A->type;
46     Paso_resetError();
47     if (A->type & MATRIX_FORMAT_CSC) {
48     Paso_setError(TYPE_ERROR,"gathering submatrices supports CSR matrix format only.");
49     } else {
50     sub_pattern=Paso_Pattern_getSubpattern(A->pattern,n_row_sub,n_col_sub,row_list,new_col_index);
51     if (Paso_noError()) {
52     /* create the return object */
53     out=Paso_SparseMatrix_alloc(type,sub_pattern,A->row_block_size,A->col_block_size);
54     if (Paso_noError()) {
55     #pragma omp parallel for private(i,k,m,subpattern_row,tmp) schedule(static)
56     for (i=0;i<n_row_sub;++i) {
57     subpattern_row=row_list[i];
58     for (k=A->pattern->ptr[subpattern_row]-index_offset;k<A->pattern->ptr[subpattern_row+1]-index_offset;++k) {
59     tmp=new_col_index[A->pattern->index[k]-index_offset];
60     if (tmp>-1) {
61     #pragma ivdep
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 gross 1639 Paso_copyShortDouble(A->block_size,&(A->val[k*A->block_size]),&(out->val[m*A->block_size]));
65 ksteube 1315 break;
66     }
67     }
68     }
69     }
70     }
71     }
72     }
73     Paso_Pattern_free(sub_pattern);
74     }
75     return out;
76     }

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