90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
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/* -- translated by f2c (version 19940927).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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*/
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#include "f2c.h"
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/* Subroutine */ int caxpy_(integer *n, complex *ca, complex *cx, integer *
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incx, complex *cy, integer *incy)
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{
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/* System generated locals */
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integer i__1, i__2, i__3, i__4;
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real r__1, r__2;
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complex q__1, q__2;
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/* Builtin functions */
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double r_imag(complex *);
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/* Local variables */
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static integer i, ix, iy;
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/* constant times a vector plus a vector.
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jack dongarra, linpack, 3/11/78.
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modified 12/3/93, array(1) declarations changed to array(*)
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Parameter adjustments
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Function Body */
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#define CY(I) cy[(I)-1]
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#define CX(I) cx[(I)-1]
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if (*n <= 0) {
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return 0;
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}
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if ((r__1 = ca->r, dabs(r__1)) + (r__2 = r_imag(ca), dabs(r__2)) == 0.f) {
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return 0;
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}
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if (*incx == 1 && *incy == 1) {
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goto L20;
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}
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/* code for unequal increments or equal increments
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not equal to 1 */
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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 <= *n; ++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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q__2.r = ca->r * CX(ix).r - ca->i * CX(ix).i, q__2.i = ca->r * CX(
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ix).i + ca->i * CX(ix).r;
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q__1.r = CY(iy).r + q__2.r, q__1.i = CY(iy).i + q__2.i;
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CY(iy).r = q__1.r, CY(iy).i = q__1.i;
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ix += *incx;
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iy += *incy;
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/* L10: */
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}
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return 0;
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/* code for both increments equal to 1 */
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L20:
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i__1 = *n;
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for (i = 1; i <= *n; ++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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q__2.r = ca->r * CX(i).r - ca->i * CX(i).i, q__2.i = ca->r * CX(
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i).i + ca->i * CX(i).r;
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q__1.r = CY(i).r + q__2.r, q__1.i = CY(i).i + q__2.i;
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CY(i).r = q__1.r, CY(i).i = q__1.i;
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/* L30: */
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}
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return 0;
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} /* caxpy_ */
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