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NAME
     zdrot - Apply a plane rotation

SYNOPSIS
     SUBROUTINE ZDROT (N, X, INCY, Y, INCY, C, S)

     INTEGER          INCX, INCY, N

     DOUBLE PRECISION C, S

     COMPLEX*16       X( * ), Y( * )



     #include <sunperf.h>

     void zdrot(int *n, doublecomplex *cx, int *incx,  doublecom-
               plex *cy, int *incy, float *c, float *s) ;

PURPOSE
     ZDROT - Apply a plane rotation, where the cos and sin (c and
     s) are real and the vectors x and y are complex.


PARAMETERS
     N         - INTEGER.
               On entry, N specifies the number  of  elements  in
               the  vector.   N must be at least one for the sub-
               routine to have any visible effect.  Unchanged  on
               exit.

     X         - COMPLEX*16 array of DIMENSION at least
               ( 1 + ( n - 1 )*abs( INCX ) ).  Before entry,  the
               incremented  array  X  must  contain the vector x.
               Unchanged on exit.

     INCX      - INTEGER.
               On entry, INCX specifies  the  increment  for  the
               elements  of  X. INCX must not be zero.  Unchanged
               on exit.

     Y         - COMPLEX*16 array of DIMENSION at least
               ( 1 + ( m - 1 )*abs( INCY  )  ).   On  entry,  the
               incremented  array Y must contain the vector y. On
               exit, Y is overwritten by the updated vector y.

     INCY      - INTEGER.
               On entry, INCY specifies  the  increment  for  the
               elements  of  Y. INCY must not be zero.  Unchanged
               on exit.

     C,        S   - DOUBLE PRECISION On entry, the cos and sin.

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