115 lines
3.7 KiB
C++
115 lines
3.7 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 doublecomplex c_b1 = {1., 0.};
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static integer c__1 = 1;
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int ztptri_(char *uplo, char *diag, integer *n, doublecomplex *ap, integer *info, ftnlen uplo_len,
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ftnlen diag_len)
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{
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integer i__1, i__2;
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doublecomplex z__1;
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void z_lmp_div(doublecomplex *, doublecomplex *, doublecomplex *);
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integer j, jc, jj;
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doublecomplex ajj;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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extern int zscal_(integer *, doublecomplex *, doublecomplex *, 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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integer jclast;
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logical nounit;
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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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nounit = lsame_(diag, (char *)"N", (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 (!nounit && !lsame_(diag, (char *)"U", (ftnlen)1, (ftnlen)1)) {
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*info = -2;
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} else if (*n < 0) {
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*info = -3;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZTPTRI", &i__1, (ftnlen)6);
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return 0;
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}
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if (nounit) {
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if (upper) {
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jj = 0;
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i__1 = *n;
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for (*info = 1; *info <= i__1; ++(*info)) {
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jj += *info;
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i__2 = jj;
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if (ap[i__2].r == 0. && ap[i__2].i == 0.) {
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return 0;
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}
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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 (*info = 1; *info <= i__1; ++(*info)) {
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i__2 = jj;
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if (ap[i__2].r == 0. && ap[i__2].i == 0.) {
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return 0;
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}
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jj = jj + *n - *info + 1;
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}
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}
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*info = 0;
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}
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if (upper) {
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jc = 1;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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if (nounit) {
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i__2 = jc + j - 1;
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z_lmp_div(&z__1, &c_b1, &ap[jc + j - 1]);
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ap[i__2].r = z__1.r, ap[i__2].i = z__1.i;
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i__2 = jc + j - 1;
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z__1.r = -ap[i__2].r, z__1.i = -ap[i__2].i;
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ajj.r = z__1.r, ajj.i = z__1.i;
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} else {
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z__1.r = -1., z__1.i = -0.;
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ajj.r = z__1.r, ajj.i = z__1.i;
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}
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i__2 = j - 1;
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ztpmv_((char *)"Upper", (char *)"No transpose", diag, &i__2, &ap[1], &ap[jc], &c__1, (ftnlen)5,
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(ftnlen)12, (ftnlen)1);
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i__2 = j - 1;
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zscal_(&i__2, &ajj, &ap[jc], &c__1);
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jc += j;
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}
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} else {
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jc = *n * (*n + 1) / 2;
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for (j = *n; j >= 1; --j) {
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if (nounit) {
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i__1 = jc;
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z_lmp_div(&z__1, &c_b1, &ap[jc]);
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ap[i__1].r = z__1.r, ap[i__1].i = z__1.i;
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i__1 = jc;
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z__1.r = -ap[i__1].r, z__1.i = -ap[i__1].i;
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ajj.r = z__1.r, ajj.i = z__1.i;
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} else {
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z__1.r = -1., z__1.i = -0.;
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ajj.r = z__1.r, ajj.i = z__1.i;
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}
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if (j < *n) {
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i__1 = *n - j;
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ztpmv_((char *)"Lower", (char *)"No transpose", diag, &i__1, &ap[jclast], &ap[jc + 1], &c__1,
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(ftnlen)5, (ftnlen)12, (ftnlen)1);
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i__1 = *n - j;
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zscal_(&i__1, &ajj, &ap[jc + 1], &c__1);
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}
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jclast = jc;
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jc = jc - *n + j - 2;
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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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