72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include "lmp_f2c.h"
|
|
static doublereal c_b4 = 1.;
|
|
static doublereal c_b5 = 0.;
|
|
static integer c__1 = 1;
|
|
int dlarf_(char *side, integer *m, integer *n, doublereal *v, integer *incv, doublereal *tau,
|
|
doublereal *c__, integer *ldc, doublereal *work, ftnlen side_len)
|
|
{
|
|
integer c_dim1, c_offset;
|
|
doublereal d__1;
|
|
integer i__;
|
|
logical applyleft;
|
|
extern int dger_(integer *, integer *, doublereal *, doublereal *, integer *, doublereal *,
|
|
integer *, doublereal *, integer *);
|
|
extern logical lsame_(char *, char *, ftnlen, ftnlen);
|
|
extern int dgemv_(char *, integer *, integer *, doublereal *, doublereal *, integer *,
|
|
doublereal *, integer *, doublereal *, doublereal *, integer *, ftnlen);
|
|
integer lastc, lastv;
|
|
extern integer iladlc_(integer *, integer *, doublereal *, integer *),
|
|
iladlr_(integer *, integer *, doublereal *, integer *);
|
|
--v;
|
|
c_dim1 = *ldc;
|
|
c_offset = 1 + c_dim1;
|
|
c__ -= c_offset;
|
|
--work;
|
|
applyleft = lsame_(side, (char *)"L", (ftnlen)1, (ftnlen)1);
|
|
lastv = 0;
|
|
lastc = 0;
|
|
if (*tau != 0.) {
|
|
if (applyleft) {
|
|
lastv = *m;
|
|
} else {
|
|
lastv = *n;
|
|
}
|
|
if (*incv > 0) {
|
|
i__ = (lastv - 1) * *incv + 1;
|
|
} else {
|
|
i__ = 1;
|
|
}
|
|
while (lastv > 0 && v[i__] == 0.) {
|
|
--lastv;
|
|
i__ -= *incv;
|
|
}
|
|
if (applyleft) {
|
|
lastc = iladlc_(&lastv, n, &c__[c_offset], ldc);
|
|
} else {
|
|
lastc = iladlr_(m, &lastv, &c__[c_offset], ldc);
|
|
}
|
|
}
|
|
if (applyleft) {
|
|
if (lastv > 0) {
|
|
dgemv_((char *)"Transpose", &lastv, &lastc, &c_b4, &c__[c_offset], ldc, &v[1], incv, &c_b5,
|
|
&work[1], &c__1, (ftnlen)9);
|
|
d__1 = -(*tau);
|
|
dger_(&lastv, &lastc, &d__1, &v[1], incv, &work[1], &c__1, &c__[c_offset], ldc);
|
|
}
|
|
} else {
|
|
if (lastv > 0) {
|
|
dgemv_((char *)"No transpose", &lastc, &lastv, &c_b4, &c__[c_offset], ldc, &v[1], incv, &c_b5,
|
|
&work[1], &c__1, (ftnlen)12);
|
|
d__1 = -(*tau);
|
|
dger_(&lastc, &lastv, &d__1, &work[1], &c__1, &v[1], incv, &c__[c_offset], ldc);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|