126 lines
4.0 KiB
C++
126 lines
4.0 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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static integer c_n1 = -1;
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int zungtr_(char *uplo, integer *n, doublecomplex *a, integer *lda, doublecomplex *tau,
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doublecomplex *work, integer *lwork, integer *info, ftnlen uplo_len)
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{
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integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
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integer i__, j, nb;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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integer iinfo;
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logical upper;
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extern int xerbla_(char *, integer *, ftnlen);
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extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
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ftnlen, ftnlen);
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integer lwkopt;
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logical lquery;
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extern int zungql_(integer *, integer *, integer *, doublecomplex *, integer *, doublecomplex *,
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doublecomplex *, integer *, integer *),
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zungqr_(integer *, integer *, integer *, doublecomplex *, integer *, doublecomplex *,
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doublecomplex *, integer *, integer *);
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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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lquery = *lwork == -1;
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upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1);
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if (!upper && !lsame_(uplo, (char *)"L", (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 {
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i__1 = 1, i__2 = *n - 1;
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if (*lwork < max(i__1, i__2) && !lquery) {
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*info = -7;
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}
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}
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if (*info == 0) {
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if (upper) {
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i__1 = *n - 1;
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i__2 = *n - 1;
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i__3 = *n - 1;
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nb = ilaenv_(&c__1, (char *)"ZUNGQL", (char *)" ", &i__1, &i__2, &i__3, &c_n1, (ftnlen)6, (ftnlen)1);
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} else {
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i__1 = *n - 1;
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i__2 = *n - 1;
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i__3 = *n - 1;
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nb = ilaenv_(&c__1, (char *)"ZUNGQR", (char *)" ", &i__1, &i__2, &i__3, &c_n1, (ftnlen)6, (ftnlen)1);
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}
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i__1 = 1, i__2 = *n - 1;
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lwkopt = max(i__1, i__2) * nb;
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work[1].r = (doublereal)lwkopt, work[1].i = 0.;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZUNGTR", &i__1, (ftnlen)6);
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return 0;
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} else if (lquery) {
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return 0;
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}
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if (*n == 0) {
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work[1].r = 1., work[1].i = 0.;
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return 0;
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}
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if (upper) {
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i__1 = *n - 1;
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for (j = 1; j <= i__1; ++j) {
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i__2 = j - 1;
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for (i__ = 1; i__ <= i__2; ++i__) {
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i__3 = i__ + j * a_dim1;
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i__4 = i__ + (j + 1) * a_dim1;
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a[i__3].r = a[i__4].r, a[i__3].i = a[i__4].i;
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}
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i__2 = *n + j * a_dim1;
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a[i__2].r = 0., a[i__2].i = 0.;
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}
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i__1 = *n - 1;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = i__ + *n * a_dim1;
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a[i__2].r = 0., a[i__2].i = 0.;
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}
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i__1 = *n + *n * a_dim1;
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a[i__1].r = 1., a[i__1].i = 0.;
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i__1 = *n - 1;
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i__2 = *n - 1;
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i__3 = *n - 1;
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zungql_(&i__1, &i__2, &i__3, &a[a_offset], lda, &tau[1], &work[1], lwork, &iinfo);
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} else {
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for (j = *n; j >= 2; --j) {
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i__1 = j * a_dim1 + 1;
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a[i__1].r = 0., a[i__1].i = 0.;
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i__1 = *n;
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for (i__ = j + 1; i__ <= i__1; ++i__) {
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i__2 = i__ + j * a_dim1;
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i__3 = i__ + (j - 1) * a_dim1;
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a[i__2].r = a[i__3].r, a[i__2].i = a[i__3].i;
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}
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}
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i__1 = a_dim1 + 1;
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a[i__1].r = 1., a[i__1].i = 0.;
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i__1 = *n;
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for (i__ = 2; i__ <= i__1; ++i__) {
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i__2 = 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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if (*n > 1) {
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i__1 = *n - 1;
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i__2 = *n - 1;
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i__3 = *n - 1;
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zungqr_(&i__1, &i__2, &i__3, &a[(a_dim1 << 1) + 2], lda, &tau[1], &work[1], lwork,
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&iinfo);
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}
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}
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work[1].r = (doublereal)lwkopt, work[1].i = 0.;
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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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