75 lines
2.5 KiB
C++
75 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 doublecomplex c_b1 = {1., 0.};
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static doublecomplex c_b2 = {0., 0.};
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static integer c__1 = 1;
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int zlarf_(char *side, integer *m, integer *n, doublecomplex *v, integer *incv, doublecomplex *tau,
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doublecomplex *c__, integer *ldc, doublecomplex *work, ftnlen side_len)
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{
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integer c_dim1, c_offset, i__1;
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doublecomplex z__1;
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integer i__;
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logical applyleft;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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integer lastc;
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extern int zgerc_(integer *, integer *, doublecomplex *, doublecomplex *, integer *,
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doublecomplex *, integer *, doublecomplex *, integer *),
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zgemv_(char *, integer *, integer *, doublecomplex *, doublecomplex *, integer *,
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doublecomplex *, integer *, doublecomplex *, doublecomplex *, integer *, ftnlen);
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integer lastv;
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extern integer ilazlc_(integer *, integer *, doublecomplex *, integer *),
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ilazlr_(integer *, integer *, doublecomplex *, integer *);
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--v;
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c_dim1 = *ldc;
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c_offset = 1 + c_dim1;
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c__ -= c_offset;
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--work;
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applyleft = lsame_(side, (char *)"L", (ftnlen)1, (ftnlen)1);
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lastv = 0;
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lastc = 0;
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if (tau->r != 0. || tau->i != 0.) {
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if (applyleft) {
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lastv = *m;
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} else {
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lastv = *n;
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}
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if (*incv > 0) {
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i__ = (lastv - 1) * *incv + 1;
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} else {
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i__ = 1;
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}
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for (;;) {
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i__1 = i__;
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if (!(lastv > 0 && (v[i__1].r == 0. && v[i__1].i == 0.))) break;
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--lastv;
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i__ -= *incv;
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}
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if (applyleft) {
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lastc = ilazlc_(&lastv, n, &c__[c_offset], ldc);
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} else {
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lastc = ilazlr_(m, &lastv, &c__[c_offset], ldc);
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}
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}
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if (applyleft) {
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if (lastv > 0) {
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zgemv_((char *)"Conjugate transpose", &lastv, &lastc, &c_b1, &c__[c_offset], ldc, &v[1], incv,
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&c_b2, &work[1], &c__1, (ftnlen)19);
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z__1.r = -tau->r, z__1.i = -tau->i;
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zgerc_(&lastv, &lastc, &z__1, &v[1], incv, &work[1], &c__1, &c__[c_offset], ldc);
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}
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} else {
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if (lastv > 0) {
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zgemv_((char *)"No transpose", &lastc, &lastv, &c_b1, &c__[c_offset], ldc, &v[1], incv, &c_b2,
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&work[1], &c__1, (ftnlen)12);
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z__1.r = -tau->r, z__1.i = -tau->i;
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zgerc_(&lastc, &lastv, &z__1, &work[1], &c__1, &v[1], incv, &c__[c_offset], ldc);
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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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