95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include "lmp_f2c.h"
|
|
static integer c__1 = 1;
|
|
static integer c_n1 = -1;
|
|
int dorghr_(integer *n, integer *ilo, integer *ihi, doublereal *a, integer *lda, doublereal *tau,
|
|
doublereal *work, integer *lwork, integer *info)
|
|
{
|
|
integer a_dim1, a_offset, i__1, i__2;
|
|
integer i__, j, nb, nh, iinfo;
|
|
extern int xerbla_(char *, integer *, ftnlen);
|
|
extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
|
|
ftnlen, ftnlen);
|
|
extern int dorgqr_(integer *, integer *, integer *, doublereal *, integer *, doublereal *,
|
|
doublereal *, integer *, integer *);
|
|
integer lwkopt;
|
|
logical lquery;
|
|
a_dim1 = *lda;
|
|
a_offset = 1 + a_dim1;
|
|
a -= a_offset;
|
|
--tau;
|
|
--work;
|
|
*info = 0;
|
|
nh = *ihi - *ilo;
|
|
lquery = *lwork == -1;
|
|
if (*n < 0) {
|
|
*info = -1;
|
|
} else if (*ilo < 1 || *ilo > max(1, *n)) {
|
|
*info = -2;
|
|
} else if (*ihi < min(*ilo, *n) || *ihi > *n) {
|
|
*info = -3;
|
|
} else if (*lda < max(1, *n)) {
|
|
*info = -5;
|
|
} else if (*lwork < max(1, nh) && !lquery) {
|
|
*info = -8;
|
|
}
|
|
if (*info == 0) {
|
|
nb = ilaenv_(&c__1, (char *)"DORGQR", (char *)" ", &nh, &nh, &nh, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
lwkopt = max(1, nh) * nb;
|
|
work[1] = (doublereal)lwkopt;
|
|
}
|
|
if (*info != 0) {
|
|
i__1 = -(*info);
|
|
xerbla_((char *)"DORGHR", &i__1, (ftnlen)6);
|
|
return 0;
|
|
} else if (lquery) {
|
|
return 0;
|
|
}
|
|
if (*n == 0) {
|
|
work[1] = 1.;
|
|
return 0;
|
|
}
|
|
i__1 = *ilo + 1;
|
|
for (j = *ihi; j >= i__1; --j) {
|
|
i__2 = j - 1;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] = 0.;
|
|
}
|
|
i__2 = *ihi;
|
|
for (i__ = j + 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] = a[i__ + (j - 1) * a_dim1];
|
|
}
|
|
i__2 = *n;
|
|
for (i__ = *ihi + 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] = 0.;
|
|
}
|
|
}
|
|
i__1 = *ilo;
|
|
for (j = 1; j <= i__1; ++j) {
|
|
i__2 = *n;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] = 0.;
|
|
}
|
|
a[j + j * a_dim1] = 1.;
|
|
}
|
|
i__1 = *n;
|
|
for (j = *ihi + 1; j <= i__1; ++j) {
|
|
i__2 = *n;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] = 0.;
|
|
}
|
|
a[j + j * a_dim1] = 1.;
|
|
}
|
|
if (nh > 0) {
|
|
dorgqr_(&nh, &nh, &nh, &a[*ilo + 1 + (*ilo + 1) * a_dim1], lda, &tau[*ilo], &work[1], lwork,
|
|
&iinfo);
|
|
}
|
|
work[1] = (doublereal)lwkopt;
|
|
return 0;
|
|
}
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|