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/*! @file creadtriple.c
* \brief Read a matrix stored in triplet (coordinate) format
*
* <pre>
* -- SuperLU routine (version 4.0) --
* Lawrence Berkeley National Laboratory.
* June 30, 2009
* </pre>
*/
#include "slu_cdefs.h"
void
creadtriple(int *m, int *n, int *nonz,
complex **nzval, int **rowind, int **colptr)
{
/*
* Output parameters
* =================
* (a,asub,xa): asub[*] contains the row subscripts of nonzeros
* in columns of matrix A; a[*] the numerical values;
* row i of A is given by a[k],k=xa[i],...,xa[i+1]-1.
*
*/
int j, k, jsize, nnz, nz;
complex *a, *val;
int *asub, *xa, *row, *col;
int zero_base = 0;
/* Matrix format:
* First line: #rows, #cols, #non-zero
* Triplet in the rest of lines:
* row, col, value
*/
scanf("%d%d", n, nonz);
*m = *n;
printf("m %d, n %d, nonz %d\n", *m, *n, *nonz);
callocateA(*n, *nonz, nzval, rowind, colptr); /* Allocate storage */
a = *nzval;
asub = *rowind;
xa = *colptr;
val = (complex *) SUPERLU_MALLOC(*nonz * sizeof(complex));
row = (int *) SUPERLU_MALLOC(*nonz * sizeof(int));
col = (int *) SUPERLU_MALLOC(*nonz * sizeof(int));
for (j = 0; j < *n; ++j) xa[j] = 0;
/* Read into the triplet array from a file */
for (nnz = 0, nz = 0; nnz < *nonz; ++nnz) {
scanf("%d%d%f%f\n", &row[nz], &col[nz], &val[nz].r, &val[nz].i);
if ( nnz == 0 ) { /* first nonzero */
if ( row[0] == 0 || col[0] == 0 ) {
zero_base = 1;
printf("triplet file: row/col indices are zero-based.\n");
} else
printf("triplet file: row/col indices are one-based.\n");
}
if ( !zero_base ) {
/* Change to 0-based indexing. */
--row[nz];
--col[nz];
}
if (row[nz] < 0 || row[nz] >= *m || col[nz] < 0 || col[nz] >= *n
/*|| val[nz] == 0.*/) {
fprintf(stderr, "nz %d, (%d, %d) = (%e,%e) out of bound, removed\n",
nz, row[nz], col[nz], val[nz].r, val[nz].i);
exit(-1);
} else {
++xa[col[nz]];
++nz;
}
}
*nonz = nz;
/* Initialize the array of column pointers */
k = 0;
jsize = xa[0];
xa[0] = 0;
for (j = 1; j < *n; ++j) {
k += jsize;
jsize = xa[j];
xa[j] = k;
}
/* Copy the triplets into the column oriented storage */
for (nz = 0; nz < *nonz; ++nz) {
j = col[nz];
k = xa[j];
asub[k] = row[nz];
a[k] = val[nz];
++xa[j];
}
/* Reset the column pointers to the beginning of each column */
for (j = *n; j > 0; --j)
xa[j] = xa[j-1];
xa[0] = 0;
SUPERLU_FREE(val);
SUPERLU_FREE(row);
SUPERLU_FREE(col);
#ifdef CHK_INPUT
{
int i;
for (i = 0; i < *n; i++) {
printf("Col %d, xa %d\n", i, xa[i]);
for (k = xa[i]; k < xa[i+1]; k++)
printf("%d\t%16.10f\n", asub[k], a[k]);
}
}
#endif
}
void creadrhs(int m, complex *b)
{
FILE *fp, *fopen();
int i;
/*int j;*/
if ( !(fp = fopen("b.dat", "r")) ) {
fprintf(stderr, "dreadrhs: file does not exist\n");
exit(-1);
}
for (i = 0; i < m; ++i)
fscanf(fp, "%f%f\n", &b[i].r, &b[i].i);
/* readpair_(j, &b[i]);*/
fclose(fp);
}
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