117 lines
3.8 KiB
C++
117 lines
3.8 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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static integer c__1 = 1;
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int dgecon_(char *norm, integer *n, doublereal *a, integer *lda, doublereal *anorm,
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doublereal *rcond, doublereal *work, integer *iwork, integer *info, ftnlen norm_len)
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{
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integer a_dim1, a_offset, i__1;
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doublereal d__1;
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doublereal sl;
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integer ix;
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doublereal su;
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integer kase, kase1;
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doublereal scale;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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integer isave[3];
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extern int drscl_(integer *, doublereal *, doublereal *, integer *),
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dlacn2_(integer *, doublereal *, doublereal *, integer *, doublereal *, integer *,
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integer *);
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extern doublereal dlamch_(char *, ftnlen);
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extern integer idamax_(integer *, doublereal *, integer *);
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extern logical disnan_(doublereal *);
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extern int xerbla_(char *, integer *, ftnlen);
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doublereal ainvnm;
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extern int dlatrs_(char *, char *, char *, char *, integer *, doublereal *, integer *,
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doublereal *, doublereal *, doublereal *, integer *, ftnlen, ftnlen, ftnlen,
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ftnlen);
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logical onenrm;
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char normin[1];
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doublereal smlnum, hugeval;
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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--work;
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--iwork;
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hugeval = dlamch_((char *)"Overflow", (ftnlen)8);
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*info = 0;
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onenrm = *(unsigned char *)norm == '1' || lsame_(norm, (char *)"O", (ftnlen)1, (ftnlen)1);
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if (!onenrm && !lsame_(norm, (char *)"I", (ftnlen)1, (ftnlen)1)) {
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*info = -1;
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} else if (*n < 0) {
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*info = -2;
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} else if (*lda < max(1, *n)) {
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*info = -4;
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} else if (*anorm < 0.) {
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*info = -5;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DGECON", &i__1, (ftnlen)6);
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return 0;
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}
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*rcond = 0.;
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if (*n == 0) {
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*rcond = 1.;
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return 0;
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} else if (*anorm == 0.) {
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return 0;
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} else if (disnan_(anorm)) {
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*rcond = *anorm;
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*info = -5;
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return 0;
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} else if (*anorm > hugeval) {
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*info = -5;
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return 0;
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}
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smlnum = dlamch_((char *)"Safe minimum", (ftnlen)12);
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ainvnm = 0.;
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*(unsigned char *)normin = 'N';
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if (onenrm) {
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kase1 = 1;
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} else {
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kase1 = 2;
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}
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kase = 0;
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L10:
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dlacn2_(n, &work[*n + 1], &work[1], &iwork[1], &ainvnm, &kase, isave);
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if (kase != 0) {
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if (kase == kase1) {
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dlatrs_((char *)"L", (char *)"N", (char *)"U", normin, n, &a[a_offset], lda, &work[1], &sl,
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&work[(*n << 1) + 1], info, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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dlatrs_((char *)"U", (char *)"N", (char *)"N", normin, n, &a[a_offset], lda, &work[1], &su, &work[*n * 3 + 1],
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info, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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} else {
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dlatrs_((char *)"U", (char *)"T", (char *)"N", normin, n, &a[a_offset], lda, &work[1], &su, &work[*n * 3 + 1],
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info, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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dlatrs_((char *)"L", (char *)"T", (char *)"U", normin, n, &a[a_offset], lda, &work[1], &sl,
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&work[(*n << 1) + 1], info, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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}
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scale = sl * su;
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*(unsigned char *)normin = 'Y';
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if (scale != 1.) {
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ix = idamax_(n, &work[1], &c__1);
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if (scale < (d__1 = work[ix], abs(d__1)) * smlnum || scale == 0.) {
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goto L20;
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}
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drscl_(n, &scale, &work[1], &c__1);
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}
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goto L10;
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}
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if (ainvnm != 0.) {
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*rcond = 1. / ainvnm / *anorm;
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} else {
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*info = 1;
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return 0;
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}
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if (disnan_(rcond) || *rcond > hugeval) {
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*info = 1;
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}
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L20:
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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