70 lines
1.3 KiB
C
70 lines
1.3 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 zscal_(integer *n, doublecomplex *za, doublecomplex *zx,
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integer *incx)
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{
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/* System generated locals */
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integer i__1, i__2, i__3;
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doublecomplex z__1;
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/* Local variables */
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static integer i, ix;
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/* scales a vector by a constant.
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jack dongarra, 3/11/78.
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modified 3/93 to return if incx .le. 0.
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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 ZX(I) zx[(I)-1]
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if (*n <= 0 || *incx <= 0) {
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return 0;
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}
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if (*incx == 1) {
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goto L20;
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}
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/* code for increment not equal to 1 */
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ix = 1;
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i__1 = *n;
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for (i = 1; i <= *n; ++i) {
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i__2 = ix;
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i__3 = ix;
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z__1.r = za->r * ZX(ix).r - za->i * ZX(ix).i, z__1.i = za->r * ZX(
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ix).i + za->i * ZX(ix).r;
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ZX(ix).r = z__1.r, ZX(ix).i = z__1.i;
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ix += *incx;
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/* L10: */
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}
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return 0;
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/* code for increment 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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z__1.r = za->r * ZX(i).r - za->i * ZX(i).i, z__1.i = za->r * ZX(
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i).i + za->i * ZX(i).r;
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ZX(i).r = z__1.r, ZX(i).i = z__1.i;
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/* L30: */
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}
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return 0;
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} /* zscal_ */
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