58 lines
1.5 KiB
C++
58 lines
1.5 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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int zaxpy_(integer *n, doublecomplex *za, doublecomplex *zx, integer *incx, doublecomplex *zy,
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integer *incy)
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{
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integer i__1, i__2, i__3, i__4;
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doublecomplex z__1, z__2;
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integer i__, ix, iy;
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extern doublereal dcabs1_(doublecomplex *);
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--zy;
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--zx;
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if (*n <= 0) {
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return 0;
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}
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if (dcabs1_(za) == 0.) {
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return 0;
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}
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if (*incx == 1 && *incy == 1) {
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = i__;
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i__3 = i__;
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i__4 = i__;
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z__2.r = za->r * zx[i__4].r - za->i * zx[i__4].i,
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z__2.i = za->r * zx[i__4].i + za->i * zx[i__4].r;
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z__1.r = zy[i__3].r + z__2.r, z__1.i = zy[i__3].i + z__2.i;
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zy[i__2].r = z__1.r, zy[i__2].i = z__1.i;
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}
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} else {
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ix = 1;
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iy = 1;
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if (*incx < 0) {
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ix = (-(*n) + 1) * *incx + 1;
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}
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if (*incy < 0) {
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iy = (-(*n) + 1) * *incy + 1;
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}
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = iy;
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i__3 = iy;
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i__4 = ix;
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z__2.r = za->r * zx[i__4].r - za->i * zx[i__4].i,
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z__2.i = za->r * zx[i__4].i + za->i * zx[i__4].r;
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z__1.r = zy[i__3].r + z__2.r, z__1.i = zy[i__3].i + z__2.i;
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zy[i__2].r = z__1.r, zy[i__2].i = z__1.i;
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ix += *incx;
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iy += *incy;
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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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