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/* blas/csrot.f -- translated by f2c (version 20050501).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/*< subroutine csrot (n,cx,incx,cy,incy,c,s) >*/
/* Subroutine */ int csrot_(integer *n, complex *cx, integer *incx, complex *
cy, integer *incy, real *c__, real *s)
{
/* System generated locals */
integer i__1, i__2, i__3, i__4;
complex q__1, q__2, q__3;
/* Local variables */
integer i__, ix, iy;
complex ctemp;
/* applies a plane rotation, where the cos and sin (c and s) are real */
/* and the vectors cx and cy are complex. */
/* jack dongarra, linpack, 3/11/78. */
/*< complex cx(1),cy(1),ctemp >*/
/*< real c,s >*/
/*< integer i,incx,incy,ix,iy,n >*/
/*< if(n.le.0)return >*/
/* Parameter adjustments */
--cy;
--cx;
/* Function Body */
if (*n <= 0) {
return 0;
}
/*< if(incx.eq.1.and.incy.eq.1)go to 20 >*/
if (*incx == 1 && *incy == 1) {
goto L20;
}
/* code for unequal increments or equal increments not equal */
/* to 1 */
/*< ix = 1 >*/
ix = 1;
/*< iy = 1 >*/
iy = 1;
/*< if(incx.lt.0)ix = (-n+1)*incx + 1 >*/
if (*incx < 0) {
ix = (-(*n) + 1) * *incx + 1;
}
/*< if(incy.lt.0)iy = (-n+1)*incy + 1 >*/
if (*incy < 0) {
iy = (-(*n) + 1) * *incy + 1;
}
/*< do 10 i = 1,n >*/
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< ctemp = c*cx(ix) + s*cy(iy) >*/
i__2 = ix;
q__2.r = *c__ * cx[i__2].r, q__2.i = *c__ * cx[i__2].i;
i__3 = iy;
q__3.r = *s * cy[i__3].r, q__3.i = *s * cy[i__3].i;
q__1.r = q__2.r + q__3.r, q__1.i = q__2.i + q__3.i;
ctemp.r = q__1.r, ctemp.i = q__1.i;
/*< cy(iy) = c*cy(iy) - s*cx(ix) >*/
i__2 = iy;
i__3 = iy;
q__2.r = *c__ * cy[i__3].r, q__2.i = *c__ * cy[i__3].i;
i__4 = ix;
q__3.r = *s * cx[i__4].r, q__3.i = *s * cx[i__4].i;
q__1.r = q__2.r - q__3.r, q__1.i = q__2.i - q__3.i;
cy[i__2].r = q__1.r, cy[i__2].i = q__1.i;
/*< cx(ix) = ctemp >*/
i__2 = ix;
cx[i__2].r = ctemp.r, cx[i__2].i = ctemp.i;
/*< ix = ix + incx >*/
ix += *incx;
/*< iy = iy + incy >*/
iy += *incy;
/*< 10 continue >*/
/* L10: */
}
/*< return >*/
return 0;
/* code for both increments equal to 1 */
/*< 20 do 30 i = 1,n >*/
L20:
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
/*< ctemp = c*cx(i) + s*cy(i) >*/
i__2 = i__;
q__2.r = *c__ * cx[i__2].r, q__2.i = *c__ * cx[i__2].i;
i__3 = i__;
q__3.r = *s * cy[i__3].r, q__3.i = *s * cy[i__3].i;
q__1.r = q__2.r + q__3.r, q__1.i = q__2.i + q__3.i;
ctemp.r = q__1.r, ctemp.i = q__1.i;
/*< cy(i) = c*cy(i) - s*cx(i) >*/
i__2 = i__;
i__3 = i__;
q__2.r = *c__ * cy[i__3].r, q__2.i = *c__ * cy[i__3].i;
i__4 = i__;
q__3.r = *s * cx[i__4].r, q__3.i = *s * cx[i__4].i;
q__1.r = q__2.r - q__3.r, q__1.i = q__2.i - q__3.i;
cy[i__2].r = q__1.r, cy[i__2].i = q__1.i;
/*< cx(i) = ctemp >*/
i__2 = i__;
cx[i__2].r = ctemp.r, cx[i__2].i = ctemp.i;
/*< 30 continue >*/
/* L30: */
}
/*< return >*/
return 0;
/*< end >*/
} /* csrot_ */
#ifdef __cplusplus
}
#endif
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