83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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static doublereal c_b8 = 1.;
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static integer c__1 = 1;
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int zpptri_(char *uplo, integer *n, doublecomplex *ap, integer *info, ftnlen uplo_len)
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{
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integer i__1, i__2, i__3;
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doublereal d__1;
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doublecomplex z__1;
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integer j, jc, jj;
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doublereal ajj;
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integer jjn;
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extern int zhpr_(char *, integer *, doublereal *, doublecomplex *, integer *, doublecomplex *,
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ftnlen);
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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extern VOID zdotc_(doublecomplex *, integer *, doublecomplex *, integer *, doublecomplex *,
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integer *);
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logical upper;
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extern int ztpmv_(char *, char *, char *, integer *, doublecomplex *, doublecomplex *,
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integer *, ftnlen, ftnlen, ftnlen),
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xerbla_(char *, integer *, ftnlen),
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zdscal_(integer *, doublereal *, doublecomplex *, integer *),
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ztptri_(char *, char *, integer *, doublecomplex *, integer *, ftnlen, ftnlen);
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--ap;
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*info = 0;
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upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1);
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if (!upper && !lsame_(uplo, (char *)"L", (ftnlen)1, (ftnlen)1)) {
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*info = -1;
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} else if (*n < 0) {
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*info = -2;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZPPTRI", &i__1, (ftnlen)6);
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return 0;
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}
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if (*n == 0) {
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return 0;
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}
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ztptri_(uplo, (char *)"N", n, &ap[1], info, (ftnlen)1, (ftnlen)1);
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if (*info > 0) {
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return 0;
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}
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if (upper) {
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jj = 0;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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jc = jj + 1;
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jj += j;
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if (j > 1) {
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i__2 = j - 1;
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zhpr_((char *)"U", &i__2, &c_b8, &ap[jc], &c__1, &ap[1], (ftnlen)1);
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}
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i__2 = jj;
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ajj = ap[i__2].r;
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zdscal_(&j, &ajj, &ap[jc], &c__1);
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}
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} else {
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jj = 1;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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jjn = jj + *n - j + 1;
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i__2 = jj;
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i__3 = *n - j + 1;
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zdotc_(&z__1, &i__3, &ap[jj], &c__1, &ap[jj], &c__1);
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d__1 = z__1.r;
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ap[i__2].r = d__1, ap[i__2].i = 0.;
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if (j < *n) {
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i__2 = *n - j;
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ztpmv_((char *)"L", (char *)"C", (char *)"N", &i__2, &ap[jjn], &ap[jj + 1], &c__1, (ftnlen)1, (ftnlen)1,
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(ftnlen)1);
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}
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jj = jjn;
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}
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}
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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