text: /* blas/zdrot.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  zdrot (n,zx,incx,zy,incy,c,s) >*/
  /* Subroutine */ int zdrot_(integer *n, doublecomplex *zx, integer *incx, 
          doublecomplex *zy, integer *incy, doublereal *c__, doublereal *s)
  {
      /* System generated locals */
      integer i__1, i__2, i__3, i__4;
      doublecomplex z__1, z__2, z__3;
  
      /* Local variables */
      integer i__, ix, iy;
      doublecomplex ztemp;
  
  
  /*     applies a plane rotation, where the cos and sin (c and s) are */
  /*     double precision and the vectors zx and zy are double complex. */
  /*     jack dongarra, linpack, 3/11/78. */
  
  /*<       double complex zx(1),zy(1),ztemp >*/
  /*<       double precision c,s >*/
  /*<       integer i,incx,incy,ix,iy,n >*/
  
  /*<       if(n.le.0)return >*/
      /* Parameter adjustments */
      --zy;
      --zx;
  
      /* 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__) {
  /*<         ztemp = c*zx(ix) + s*zy(iy) >*/
          i__2 = ix;
          z__2.r = *c__ * zx[i__2].r, z__2.i = *c__ * zx[i__2].i;
          i__3 = iy;
          z__3.r = *s * zy[i__3].r, z__3.i = *s * zy[i__3].i;
          z__1.r = z__2.r + z__3.r, z__1.i = z__2.i + z__3.i;
          ztemp.r = z__1.r, ztemp.i = z__1.i;
  /*<         zy(iy) = c*zy(iy) - s*zx(ix) >*/
          i__2 = iy;
          i__3 = iy;
          z__2.r = *c__ * zy[i__3].r, z__2.i = *c__ * zy[i__3].i;
          i__4 = ix;
          z__3.r = *s * zx[i__4].r, z__3.i = *s * zx[i__4].i;
          z__1.r = z__2.r - z__3.r, z__1.i = z__2.i - z__3.i;
          zy[i__2].r = z__1.r, zy[i__2].i = z__1.i;
  /*<         zx(ix) = ztemp >*/
          i__2 = ix;
          zx[i__2].r = ztemp.r, zx[i__2].i = ztemp.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__) {
  /*<         ztemp = c*zx(i) + s*zy(i) >*/
          i__2 = i__;
          z__2.r = *c__ * zx[i__2].r, z__2.i = *c__ * zx[i__2].i;
          i__3 = i__;
          z__3.r = *s * zy[i__3].r, z__3.i = *s * zy[i__3].i;
          z__1.r = z__2.r + z__3.r, z__1.i = z__2.i + z__3.i;
          ztemp.r = z__1.r, ztemp.i = z__1.i;
  /*<         zy(i) = c*zy(i) - s*zx(i) >*/
          i__2 = i__;
          i__3 = i__;
          z__2.r = *c__ * zy[i__3].r, z__2.i = *c__ * zy[i__3].i;
          i__4 = i__;
          z__3.r = *s * zx[i__4].r, z__3.i = *s * zx[i__4].i;
          z__1.r = z__2.r - z__3.r, z__1.i = z__2.i - z__3.i;
          zy[i__2].r = z__1.r, zy[i__2].i = z__1.i;
  /*<         zx(i) = ztemp >*/
          i__2 = i__;
          zx[i__2].r = ztemp.r, zx[i__2].i = ztemp.i;
  /*<    30 continue >*/
  /* L30: */
      }
  /*<       return >*/
      return 0;
  /*<       end >*/
  } /* zdrot_ */
  
  #ifdef __cplusplus
          }
  #endif
  