113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include "lmp_f2c.h"
|
|
static integer c__1 = 1;
|
|
static integer c_n1 = -1;
|
|
static integer c__3 = 3;
|
|
static integer c__2 = 2;
|
|
int dgeqrf_(integer *m, integer *n, doublereal *a, integer *lda, doublereal *tau, doublereal *work,
|
|
integer *lwork, integer *info)
|
|
{
|
|
integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
|
|
integer i__, k, ib, nb, nx, iws, nbmin, iinfo;
|
|
extern int dgeqr2_(integer *, integer *, doublereal *, integer *, doublereal *, doublereal *,
|
|
integer *),
|
|
dlarfb_(char *, char *, char *, char *, integer *, integer *, integer *, doublereal *,
|
|
integer *, doublereal *, integer *, doublereal *, integer *, doublereal *,
|
|
integer *, ftnlen, ftnlen, ftnlen, ftnlen),
|
|
dlarft_(char *, char *, integer *, integer *, doublereal *, integer *, doublereal *,
|
|
doublereal *, integer *, ftnlen, ftnlen),
|
|
xerbla_(char *, integer *, ftnlen);
|
|
extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
|
|
ftnlen, ftnlen);
|
|
integer ldwork, lwkopt;
|
|
logical lquery;
|
|
a_dim1 = *lda;
|
|
a_offset = 1 + a_dim1;
|
|
a -= a_offset;
|
|
--tau;
|
|
--work;
|
|
k = min(*m, *n);
|
|
*info = 0;
|
|
nb = ilaenv_(&c__1, (char *)"DGEQRF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
lquery = *lwork == -1;
|
|
if (*m < 0) {
|
|
*info = -1;
|
|
} else if (*n < 0) {
|
|
*info = -2;
|
|
} else if (*lda < max(1, *m)) {
|
|
*info = -4;
|
|
} else if (!lquery) {
|
|
if (*lwork <= 0 || *m > 0 && *lwork < max(1, *n)) {
|
|
*info = -7;
|
|
}
|
|
}
|
|
if (*info != 0) {
|
|
i__1 = -(*info);
|
|
xerbla_((char *)"DGEQRF", &i__1, (ftnlen)6);
|
|
return 0;
|
|
} else if (lquery) {
|
|
if (k == 0) {
|
|
lwkopt = 1;
|
|
} else {
|
|
lwkopt = *n * nb;
|
|
}
|
|
work[1] = (doublereal)lwkopt;
|
|
return 0;
|
|
}
|
|
if (k == 0) {
|
|
work[1] = 1.;
|
|
return 0;
|
|
}
|
|
nbmin = 2;
|
|
nx = 0;
|
|
iws = *n;
|
|
if (nb > 1 && nb < k) {
|
|
i__1 = 0, i__2 = ilaenv_(&c__3, (char *)"DGEQRF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
nx = max(i__1, i__2);
|
|
if (nx < k) {
|
|
ldwork = *n;
|
|
iws = ldwork * nb;
|
|
if (*lwork < iws) {
|
|
nb = *lwork / ldwork;
|
|
i__1 = 2,
|
|
i__2 = ilaenv_(&c__2, (char *)"DGEQRF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
nbmin = max(i__1, i__2);
|
|
}
|
|
}
|
|
}
|
|
if (nb >= nbmin && nb < k && nx < k) {
|
|
i__1 = k - nx;
|
|
i__2 = nb;
|
|
for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
|
|
i__3 = k - i__ + 1;
|
|
ib = min(i__3, nb);
|
|
i__3 = *m - i__ + 1;
|
|
dgeqr2_(&i__3, &ib, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1], &iinfo);
|
|
if (i__ + ib <= *n) {
|
|
i__3 = *m - i__ + 1;
|
|
dlarft_((char *)"F", (char *)"C", &i__3, &ib, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1],
|
|
&ldwork, (ftnlen)1, (ftnlen)1);
|
|
i__3 = *m - i__ + 1;
|
|
i__4 = *n - i__ - ib + 1;
|
|
dlarfb_((char *)"L", (char *)"T", (char *)"F", (char *)"C", &i__3, &i__4, &ib, &a[i__ + i__ * a_dim1], lda,
|
|
&work[1], &ldwork, &a[i__ + (i__ + ib) * a_dim1], lda, &work[ib + 1],
|
|
&ldwork, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
|
|
}
|
|
}
|
|
} else {
|
|
i__ = 1;
|
|
}
|
|
if (i__ <= k) {
|
|
i__2 = *m - i__ + 1;
|
|
i__1 = *n - i__ + 1;
|
|
dgeqr2_(&i__2, &i__1, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1], &iinfo);
|
|
}
|
|
work[1] = (doublereal)iws;
|
|
return 0;
|
|
}
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|