89 lines
3.1 KiB
C++
89 lines
3.1 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 ztrti2_(char *uplo, char *diag, integer *n, doublecomplex *a, integer *lda, integer *info,
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ftnlen uplo_len, ftnlen diag_len)
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{
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integer a_dim1, a_offset, 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;
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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 ztrmv_(char *, char *, char *, integer *, doublecomplex *, integer *,
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doublecomplex *, integer *, ftnlen, ftnlen, ftnlen),
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xerbla_(char *, integer *, ftnlen);
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logical nounit;
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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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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} else if (*lda < max(1, *n)) {
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*info = -5;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZTRTI2", &i__1, (ftnlen)6);
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return 0;
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}
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if (upper) {
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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 = j + j * a_dim1;
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z_lmp_div(&z__1, &c_b1, &a[j + j * a_dim1]);
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a[i__2].r = z__1.r, a[i__2].i = z__1.i;
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i__2 = j + j * a_dim1;
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z__1.r = -a[i__2].r, z__1.i = -a[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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ztrmv_((char *)"U", (char *)"N", diag, &i__2, &a[a_offset], lda, &a[j * a_dim1 + 1], &c__1, (ftnlen)1,
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(ftnlen)1, (ftnlen)1);
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i__2 = j - 1;
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zscal_(&i__2, &ajj, &a[j * a_dim1 + 1], &c__1);
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}
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} else {
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for (j = *n; j >= 1; --j) {
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if (nounit) {
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i__1 = j + j * a_dim1;
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z_lmp_div(&z__1, &c_b1, &a[j + j * a_dim1]);
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a[i__1].r = z__1.r, a[i__1].i = z__1.i;
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i__1 = j + j * a_dim1;
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z__1.r = -a[i__1].r, z__1.i = -a[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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ztrmv_((char *)"L", (char *)"N", diag, &i__1, &a[j + 1 + (j + 1) * a_dim1], lda,
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&a[j + 1 + j * a_dim1], &c__1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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i__1 = *n - j;
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zscal_(&i__1, &ajj, &a[j + 1 + j * a_dim1], &c__1);
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}
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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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