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

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Revision 155 - (show annotations)
Wed Nov 9 02:02:19 2005 UTC (13 years, 10 months ago) by jgs
File MIME type: text/plain
File size: 3271 byte(s)
move all directories from trunk/esys2 into trunk and remove esys2

1 /* $Id$ */
2
3 /**************************************************************/
4
5 /* Paso: SystemMatrix */
6
7 /* returns a borrowed reference to the matrix normaliztion vector */
8
9 /* if the vector is in valid a new vector is calculate as the inverse */
10 /* of the sum of the absolute value in each row/column */
11
12 /**************************************************************/
13
14 /* Copyrights by ACcESS Australia 2005 */
15 /* Author: gross@access.edu.au */
16
17 /**************************************************************/
18
19 #include "Paso.h"
20 #include "SystemMatrix.h"
21
22 double* Paso_SystemMatrix_borrowNormalization(Paso_SystemMatrix* A) {
23 dim_t ir,irow,ic,icb,icol,irb;
24 index_t iptr,icol_failed,irow_failed;
25 double fac;
26 if (!A->normalizer_is_valid) {
27 switch(A->type) {
28 case CSR:
29 irow_failed=-1;
30 #pragma omp parallel for private(ir,irb,irow,fac,iptr,icb) schedule(static)
31 for (ir=0;ir< A->pattern->n_ptr;ir++) {
32 for (irb=0;irb< A->row_block_size;irb++) {
33 irow=irb+A->row_block_size*ir;
34 fac=0.;
35 for (iptr=A->pattern->ptr[ir]-PTR_OFFSET;iptr<A->pattern->ptr[ir+1]-PTR_OFFSET; iptr++) {
36 for (icb=0;icb< A->col_block_size;icb++)
37 fac+=ABS(A->val[iptr*A->block_size+irb+A->row_block_size*icb]);
38 }
39 if (fac>0) {
40 A->normalizer[irow]=1./fac;
41 } else {
42 A->normalizer[irow]=1.;
43 irow_failed=irow;
44 }
45 }
46 }
47 if (irow_failed>=0) {
48 Paso_setError(ZERO_DIVISION_ERROR,"There is a row containing zero entries only.");
49 }
50 break;
51 case CSC:
52 icol_failed=-1;
53 #pragma omp parallel for private(ic,icb,icol,fac,iptr,irb) schedule(static)
54 for (ic=0;ic< A->pattern->n_ptr;ic++) {
55 for (icb=0;icb< A->col_block_size;icb++) {
56 icol=icb+A->col_block_size*ic;
57 fac=0.;
58 for (iptr=A->pattern->ptr[ic]-PTR_OFFSET;iptr<A->pattern->ptr[ic+1]-PTR_OFFSET; iptr++) {
59 for (irb=0;irb< A->row_block_size;irb++)
60 fac+=ABS(A->val[iptr*A->block_size+irb+A->row_block_size*icb]);
61 }
62 if (fac>0) {
63 A->normalizer[icol]=1./fac;
64 } else {
65 A->normalizer[icol]=1.;
66 icol_failed=icol;
67 }
68 }
69 }
70 if (icol_failed>=0) {
71 Paso_setError(ZERO_DIVISION_ERROR,"There is a column containing zero entries only.");
72 }
73 break;
74 default:
75 Paso_setError(TYPE_ERROR,"No normalization available for this matrix type.");
76 } /* switch A->type */
77 A->normalizer_is_valid=TRUE;
78 }
79 return A->normalizer;
80 }
81 /*
82 * $Log$
83 * Revision 1.2 2005/09/15 03:44:39 jgs
84 * Merge of development branch dev-02 back to main trunk on 2005-09-15
85 *
86 * Revision 1.1.2.1 2005/09/05 06:29:47 gross
87 * These files have been extracted from finley to define a stand alone libray for iterative
88 * linear solvers on the ALTIX. main entry through Paso_solve. this version compiles but
89 * has not been tested yet.
90 *
91 *
92 */

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