185 lines
6.1 KiB
C++
185 lines
6.1 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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int dtrsv_(char *uplo, char *trans, char *diag, integer *n, doublereal *a, integer *lda,
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doublereal *x, integer *incx, ftnlen uplo_len, ftnlen trans_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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integer i__, j, ix, jx, kx, info;
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doublereal temp;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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extern int 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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--x;
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info = 0;
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if (!lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1) && !lsame_(uplo, (char *)"L", (ftnlen)1, (ftnlen)1)) {
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info = 1;
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} else if (!lsame_(trans, (char *)"N", (ftnlen)1, (ftnlen)1) &&
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!lsame_(trans, (char *)"T", (ftnlen)1, (ftnlen)1) &&
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!lsame_(trans, (char *)"C", (ftnlen)1, (ftnlen)1)) {
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info = 2;
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} else if (!lsame_(diag, (char *)"U", (ftnlen)1, (ftnlen)1) &&
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!lsame_(diag, (char *)"N", (ftnlen)1, (ftnlen)1)) {
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info = 3;
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} else if (*n < 0) {
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info = 4;
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} else if (*lda < max(1, *n)) {
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info = 6;
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} else if (*incx == 0) {
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info = 8;
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}
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if (info != 0) {
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xerbla_((char *)"DTRSV ", &info, (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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nounit = lsame_(diag, (char *)"N", (ftnlen)1, (ftnlen)1);
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if (*incx <= 0) {
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kx = 1 - (*n - 1) * *incx;
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} else if (*incx != 1) {
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kx = 1;
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}
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if (lsame_(trans, (char *)"N", (ftnlen)1, (ftnlen)1)) {
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if (lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1)) {
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if (*incx == 1) {
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for (j = *n; j >= 1; --j) {
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if (x[j] != 0.) {
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if (nounit) {
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x[j] /= a[j + j * a_dim1];
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}
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temp = x[j];
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for (i__ = j - 1; i__ >= 1; --i__) {
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x[i__] -= temp * a[i__ + j * a_dim1];
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}
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}
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}
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} else {
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jx = kx + (*n - 1) * *incx;
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for (j = *n; j >= 1; --j) {
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if (x[jx] != 0.) {
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if (nounit) {
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x[jx] /= a[j + j * a_dim1];
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}
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temp = x[jx];
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ix = jx;
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for (i__ = j - 1; i__ >= 1; --i__) {
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ix -= *incx;
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x[ix] -= temp * a[i__ + j * a_dim1];
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}
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}
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jx -= *incx;
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}
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}
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} else {
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if (*incx == 1) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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if (x[j] != 0.) {
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if (nounit) {
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x[j] /= a[j + j * a_dim1];
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}
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temp = x[j];
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i__2 = *n;
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for (i__ = j + 1; i__ <= i__2; ++i__) {
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x[i__] -= temp * a[i__ + j * a_dim1];
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}
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}
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}
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} else {
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jx = kx;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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if (x[jx] != 0.) {
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if (nounit) {
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x[jx] /= a[j + j * a_dim1];
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}
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temp = x[jx];
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ix = jx;
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i__2 = *n;
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for (i__ = j + 1; i__ <= i__2; ++i__) {
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ix += *incx;
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x[ix] -= temp * a[i__ + j * a_dim1];
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}
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}
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jx += *incx;
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}
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}
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}
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} else {
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if (lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1)) {
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if (*incx == 1) {
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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temp = x[j];
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i__2 = j - 1;
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for (i__ = 1; i__ <= i__2; ++i__) {
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temp -= a[i__ + j * a_dim1] * x[i__];
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}
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if (nounit) {
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temp /= a[j + j * a_dim1];
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}
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x[j] = temp;
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}
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} else {
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jx = kx;
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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temp = x[jx];
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ix = kx;
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i__2 = j - 1;
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for (i__ = 1; i__ <= i__2; ++i__) {
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temp -= a[i__ + j * a_dim1] * x[ix];
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ix += *incx;
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}
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if (nounit) {
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temp /= a[j + j * a_dim1];
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}
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x[jx] = temp;
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jx += *incx;
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}
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}
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} else {
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if (*incx == 1) {
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for (j = *n; j >= 1; --j) {
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temp = x[j];
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i__1 = j + 1;
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for (i__ = *n; i__ >= i__1; --i__) {
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temp -= a[i__ + j * a_dim1] * x[i__];
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}
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if (nounit) {
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temp /= a[j + j * a_dim1];
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}
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x[j] = temp;
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}
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} else {
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kx += (*n - 1) * *incx;
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jx = kx;
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for (j = *n; j >= 1; --j) {
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temp = x[jx];
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ix = kx;
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i__1 = j + 1;
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for (i__ = *n; i__ >= i__1; --i__) {
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temp -= a[i__ + j * a_dim1] * x[ix];
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ix -= *incx;
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}
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if (nounit) {
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temp /= a[j + j * a_dim1];
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}
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x[jx] = temp;
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jx -= *incx;
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}
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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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