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Revision 2548 - (show annotations)
Mon Jul 20 06:20:06 2009 UTC (10 years, 3 months ago) by jfenwick
Original Path: trunk/paso/src/SparseMatrix_getSubmatrix.c
File MIME type: text/plain
File size: 2982 byte(s)
Updating copyright notices
1
2 /*******************************************************
3 *
4 * Copyright (c) 2003-2009 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
14
15 /**************************************************************/
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 Paso_copyShortDouble(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_Pattern_free(sub_pattern);
74 }
75 return out;
76 }

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