Actual source code: setr.c
1: /* setr.f -- translated by f2c (version of 25 March 1992 12:58:56). */
3: #include <../src/mat/graphops/color/impls/minpack/color.h>
5: PetscErrorCode MINPACKsetr(PetscInt *m, PetscInt *n, PetscInt *indrow, PetscInt *jpntr, PetscInt *indcol, PetscInt *ipntr, PetscInt *iwa)
6: {
7: /* System generated locals */
8: PetscInt i__1, i__2;
10: /* Local variables */
11: PetscInt jcol, jp, ir;
13: /* Given a column-oriented definition of the sparsity pattern */
14: /* of an m by n matrix A, this subroutine determines a */
15: /* row-oriented definition of the sparsity pattern of A. */
16: /* On input the column-oriented definition is specified by */
17: /* the arrays indrow and jpntr. On output the row-oriented */
18: /* definition is specified by the arrays indcol and ipntr. */
19: /* The subroutine statement is */
20: /* subroutine setr(m,n,indrow,jpntr,indcol,ipntr,iwa) */
21: /* where */
22: /* m is a positive integer input variable set to the number */
23: /* of rows of A. */
24: /* n is a positive integer input variable set to the number */
25: /* of columns of A. */
26: /* indrow is an integer input array which contains the row */
27: /* indices for the non-zeroes in the matrix A. */
28: /* jpntr is an integer input array of length n + 1 which */
29: /* specifies the locations of the row indices in indrow. */
30: /* The row indices for column j are */
31: /* indrow(k), k = jpntr(j),...,jpntr(j+1)-1. */
32: /* Note that jpntr(n+1)-1 is then the number of non-zero */
33: /* elements of the matrix A. */
34: /* indcol is an integer output array which contains the */
35: /* column indices for the non-zeroes in the matrix A. */
36: /* ipntr is an integer output array of length m + 1 which */
37: /* specifies the locations of the column indices in indcol. */
38: /* The column indices for row i are */
39: /* indcol(k), k = ipntr(i),...,ipntr(i+1)-1. */
40: /* Note that ipntr(1) is set to 1 and that ipntr(m+1)-1 is */
41: /* then the number of non-zero elements of the matrix A. */
42: /* iwa is an integer work array of length m. */
43: /* Argonne National Laboratory. MINPACK Project. July 1983. */
44: /* Thomas F. Coleman, Burton S. Garbow, Jorge J. More' */
46: /* Store in array iwa the counts of non-zeroes in the rows. */
48: PetscFunctionBegin;
49: /* Parameter adjustments */
50: --iwa;
51: --ipntr;
52: --indcol;
53: --jpntr;
54: --indrow;
56: /* Function Body */
57: i__1 = *m;
58: for (ir = 1; ir <= i__1; ++ir) iwa[ir] = 0;
60: i__1 = jpntr[*n + 1] - 1;
61: for (jp = 1; jp <= i__1; ++jp) ++iwa[indrow[jp]];
63: /* Set pointers to the start of the rows in indcol. */
65: ipntr[1] = 1;
66: i__1 = *m;
68: for (ir = 1; ir <= i__1; ++ir) {
69: ipntr[ir + 1] = ipntr[ir] + iwa[ir];
70: iwa[ir] = ipntr[ir];
71: }
73: /* Fill indcol. */
75: i__1 = *n;
76: for (jcol = 1; jcol <= i__1; ++jcol) {
77: i__2 = jpntr[jcol + 1] - 1;
78: for (jp = jpntr[jcol]; jp <= i__2; ++jp) {
79: ir = indrow[jp];
80: indcol[iwa[ir]] = jcol;
81: ++iwa[ir];
82: }
83: }
84: PetscFunctionReturn(PETSC_SUCCESS);
85: }