51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include "lmp_f2c.h"
|
|
static integer c__1 = 1;
|
|
int dgeqr2_(integer *m, integer *n, doublereal *a, integer *lda, doublereal *tau, doublereal *work,
|
|
integer *info)
|
|
{
|
|
integer a_dim1, a_offset, i__1, i__2, i__3;
|
|
integer i__, k;
|
|
extern int dlarfg_(integer *, doublereal *, doublereal *, integer *, doublereal *),
|
|
xerbla_(char *, integer *, ftnlen),
|
|
dlarf1f_(char *, integer *, integer *, doublereal *, integer *, doublereal *, doublereal *,
|
|
integer *, doublereal *, ftnlen);
|
|
a_dim1 = *lda;
|
|
a_offset = 1 + a_dim1;
|
|
a -= a_offset;
|
|
--tau;
|
|
--work;
|
|
*info = 0;
|
|
if (*m < 0) {
|
|
*info = -1;
|
|
} else if (*n < 0) {
|
|
*info = -2;
|
|
} else if (*lda < max(1, *m)) {
|
|
*info = -4;
|
|
}
|
|
if (*info != 0) {
|
|
i__1 = -(*info);
|
|
xerbla_((char *)"DGEQR2", &i__1, (ftnlen)6);
|
|
return 0;
|
|
}
|
|
k = min(*m, *n);
|
|
i__1 = k;
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
|
i__2 = *m - i__ + 1;
|
|
i__3 = i__ + 1;
|
|
dlarfg_(&i__2, &a[i__ + i__ * a_dim1], &a[min(i__3, *m) + i__ * a_dim1], &c__1, &tau[i__]);
|
|
if (i__ < *n) {
|
|
i__2 = *m - i__ + 1;
|
|
i__3 = *n - i__;
|
|
dlarf1f_((char *)"L", &i__2, &i__3, &a[i__ + i__ * a_dim1], &c__1, &tau[i__],
|
|
&a[i__ + (i__ + 1) * a_dim1], lda, &work[1], (ftnlen)1);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|