98 lines
2.9 KiB
C++
98 lines
2.9 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 integer c__1 = 1;
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static doublereal c_b16 = -1.;
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int zpptrf_(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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double sqrt(doublereal);
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integer j, jc, jj;
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doublereal ajj;
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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 ztpsv_(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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--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 *)"ZPPTRF", &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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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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ztpsv_((char *)"U", (char *)"C", (char *)"N", &i__2, &ap[1], &ap[jc], &c__1, (ftnlen)1, (ftnlen)1,
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(ftnlen)1);
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}
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i__2 = jj;
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i__3 = j - 1;
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zdotc_(&z__1, &i__3, &ap[jc], &c__1, &ap[jc], &c__1);
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ajj = ap[i__2].r - z__1.r;
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if (ajj <= 0.) {
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i__2 = jj;
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ap[i__2].r = ajj, ap[i__2].i = 0.;
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goto L30;
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}
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i__2 = jj;
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d__1 = sqrt(ajj);
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ap[i__2].r = d__1, ap[i__2].i = 0.;
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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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i__2 = jj;
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ajj = ap[i__2].r;
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if (ajj <= 0.) {
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i__2 = jj;
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ap[i__2].r = ajj, ap[i__2].i = 0.;
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goto L30;
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}
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ajj = sqrt(ajj);
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i__2 = jj;
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ap[i__2].r = ajj, ap[i__2].i = 0.;
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if (j < *n) {
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i__2 = *n - j;
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d__1 = 1. / ajj;
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zdscal_(&i__2, &d__1, &ap[jj + 1], &c__1);
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i__2 = *n - j;
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zhpr_((char *)"L", &i__2, &c_b16, &ap[jj + 1], &c__1, &ap[jj + *n - j + 1], (ftnlen)1);
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jj = jj + *n - j + 1;
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}
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}
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}
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goto L40;
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L30:
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*info = j;
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L40:
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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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