79 lines
2.3 KiB
C++
79 lines
2.3 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 zung2r_(integer *m, integer *n, integer *k, doublecomplex *a, integer *lda, doublecomplex *tau,
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doublecomplex *work, integer *info)
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{
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integer a_dim1, a_offset, i__1, i__2, i__3;
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doublecomplex z__1;
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integer i__, j, l;
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extern int zscal_(integer *, doublecomplex *, doublecomplex *, integer *),
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zlarf_(char *, integer *, integer *, doublecomplex *, integer *, doublecomplex *,
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doublecomplex *, integer *, doublecomplex *, ftnlen),
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xerbla_(char *, integer *, ftnlen);
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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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--tau;
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--work;
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*info = 0;
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if (*m < 0) {
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*info = -1;
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} else if (*n < 0 || *n > *m) {
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*info = -2;
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} else if (*k < 0 || *k > *n) {
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*info = -3;
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} else if (*lda < max(1, *m)) {
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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 *)"ZUNG2R", &i__1, (ftnlen)6);
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return 0;
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}
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if (*n <= 0) {
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return 0;
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}
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i__1 = *n;
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for (j = *k + 1; j <= i__1; ++j) {
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i__2 = *m;
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for (l = 1; l <= i__2; ++l) {
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i__3 = l + j * a_dim1;
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a[i__3].r = 0., a[i__3].i = 0.;
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}
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i__2 = j + j * a_dim1;
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a[i__2].r = 1., a[i__2].i = 0.;
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}
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for (i__ = *k; i__ >= 1; --i__) {
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if (i__ < *n) {
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i__1 = i__ + i__ * a_dim1;
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a[i__1].r = 1., a[i__1].i = 0.;
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i__1 = *m - i__ + 1;
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i__2 = *n - i__;
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zlarf_((char *)"Left", &i__1, &i__2, &a[i__ + i__ * a_dim1], &c__1, &tau[i__],
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&a[i__ + (i__ + 1) * a_dim1], lda, &work[1], (ftnlen)4);
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}
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if (i__ < *m) {
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i__1 = *m - i__;
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i__2 = i__;
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z__1.r = -tau[i__2].r, z__1.i = -tau[i__2].i;
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zscal_(&i__1, &z__1, &a[i__ + 1 + i__ * a_dim1], &c__1);
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}
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i__1 = i__ + i__ * a_dim1;
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i__2 = i__;
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z__1.r = 1. - tau[i__2].r, z__1.i = 0. - tau[i__2].i;
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a[i__1].r = z__1.r, a[i__1].i = z__1.i;
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i__1 = i__ - 1;
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for (l = 1; l <= i__1; ++l) {
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i__2 = l + i__ * a_dim1;
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a[i__2].r = 0., a[i__2].i = 0.;
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}
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}
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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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