98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include "lmp_f2c.h"
|
|
static integer c__1 = 1;
|
|
static doublereal c_b16 = -1.;
|
|
int zpptrf_(char *uplo, integer *n, doublecomplex *ap, integer *info, ftnlen uplo_len)
|
|
{
|
|
integer i__1, i__2, i__3;
|
|
doublereal d__1;
|
|
doublecomplex z__1;
|
|
double sqrt(doublereal);
|
|
integer j, jc, jj;
|
|
doublereal ajj;
|
|
extern int zhpr_(char *, integer *, doublereal *, doublecomplex *, integer *, doublecomplex *,
|
|
ftnlen);
|
|
extern logical lsame_(char *, char *, ftnlen, ftnlen);
|
|
extern VOID zdotc_(doublecomplex *, integer *, doublecomplex *, integer *, doublecomplex *,
|
|
integer *);
|
|
logical upper;
|
|
extern int ztpsv_(char *, char *, char *, integer *, doublecomplex *, doublecomplex *,
|
|
integer *, ftnlen, ftnlen, ftnlen),
|
|
xerbla_(char *, integer *, ftnlen),
|
|
zdscal_(integer *, doublereal *, doublecomplex *, integer *);
|
|
--ap;
|
|
*info = 0;
|
|
upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1);
|
|
if (!upper && !lsame_(uplo, (char *)"L", (ftnlen)1, (ftnlen)1)) {
|
|
*info = -1;
|
|
} else if (*n < 0) {
|
|
*info = -2;
|
|
}
|
|
if (*info != 0) {
|
|
i__1 = -(*info);
|
|
xerbla_((char *)"ZPPTRF", &i__1, (ftnlen)6);
|
|
return 0;
|
|
}
|
|
if (*n == 0) {
|
|
return 0;
|
|
}
|
|
if (upper) {
|
|
jj = 0;
|
|
i__1 = *n;
|
|
for (j = 1; j <= i__1; ++j) {
|
|
jc = jj + 1;
|
|
jj += j;
|
|
if (j > 1) {
|
|
i__2 = j - 1;
|
|
ztpsv_((char *)"Upper", (char *)"Conjugate transpose", (char *)"Non-unit", &i__2, &ap[1], &ap[jc], &c__1,
|
|
(ftnlen)5, (ftnlen)19, (ftnlen)8);
|
|
}
|
|
i__2 = jj;
|
|
i__3 = j - 1;
|
|
zdotc_(&z__1, &i__3, &ap[jc], &c__1, &ap[jc], &c__1);
|
|
ajj = ap[i__2].r - z__1.r;
|
|
if (ajj <= 0.) {
|
|
i__2 = jj;
|
|
ap[i__2].r = ajj, ap[i__2].i = 0.;
|
|
goto L30;
|
|
}
|
|
i__2 = jj;
|
|
d__1 = sqrt(ajj);
|
|
ap[i__2].r = d__1, ap[i__2].i = 0.;
|
|
}
|
|
} else {
|
|
jj = 1;
|
|
i__1 = *n;
|
|
for (j = 1; j <= i__1; ++j) {
|
|
i__2 = jj;
|
|
ajj = ap[i__2].r;
|
|
if (ajj <= 0.) {
|
|
i__2 = jj;
|
|
ap[i__2].r = ajj, ap[i__2].i = 0.;
|
|
goto L30;
|
|
}
|
|
ajj = sqrt(ajj);
|
|
i__2 = jj;
|
|
ap[i__2].r = ajj, ap[i__2].i = 0.;
|
|
if (j < *n) {
|
|
i__2 = *n - j;
|
|
d__1 = 1. / ajj;
|
|
zdscal_(&i__2, &d__1, &ap[jj + 1], &c__1);
|
|
i__2 = *n - j;
|
|
zhpr_((char *)"Lower", &i__2, &c_b16, &ap[jj + 1], &c__1, &ap[jj + *n - j + 1], (ftnlen)5);
|
|
jj = jj + *n - j + 1;
|
|
}
|
|
}
|
|
}
|
|
goto L40;
|
|
L30:
|
|
*info = j;
|
|
L40:
|
|
return 0;
|
|
}
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|