56 lines
1.5 KiB
C++
56 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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VOID zdotu_(doublecomplex *ret_val, integer *n, 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;
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doublecomplex z__1, z__2;
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integer i__, ix, iy;
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doublecomplex ztemp;
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--zy;
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--zx;
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ztemp.r = 0., ztemp.i = 0.;
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ret_val->r = 0., ret_val->i = 0.;
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if (*n <= 0) {
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return;
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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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z__2.r = zx[i__2].r * zy[i__3].r - zx[i__2].i * zy[i__3].i,
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z__2.i = zx[i__2].r * zy[i__3].i + zx[i__2].i * zy[i__3].r;
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z__1.r = ztemp.r + z__2.r, z__1.i = ztemp.i + z__2.i;
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ztemp.r = z__1.r, ztemp.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 = ix;
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i__3 = iy;
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z__2.r = zx[i__2].r * zy[i__3].r - zx[i__2].i * zy[i__3].i,
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z__2.i = zx[i__2].r * zy[i__3].i + zx[i__2].i * zy[i__3].r;
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z__1.r = ztemp.r + z__2.r, z__1.i = ztemp.i + z__2.i;
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ztemp.r = z__1.r, ztemp.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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ret_val->r = ztemp.r, ret_val->i = ztemp.i;
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return;
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}
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#ifdef __cplusplus
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}
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#endif
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