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NAME
     zrot - apply a plane rotation, where the cos (C) is real and
     the  sin  (S) is complex, and the vectors CX and CY are com-
     plex

SYNOPSIS
     SUBROUTINE ZROT( N, CX, INCX, CY, INCY, C, S )

     INTEGER INCX, INCY, N

     DOUBLE PRECISION C

     COMPLEX*16 S

     COMPLEX*16 CX( * ), CY( * )



     #include <sunperf.h>

     void zrot(int n, doublecomplex *cx, int incx,  doublecomplex
               *cy, int incy, double c, doublecomplex *s) ;

PURPOSE
     ZROT   applies a plane rotation, where the cos (C)  is  real
     and  the  sin  (S) is complex, and the vectors CX and CY are
     complex.


ARGUMENTS
     N         (input) INTEGER
               The number of elements in the vectors CX and CY.

     CX        (input/output) COMPLEX*16 array, dimension (N)
               On  input,  the  vector  X.   On  output,  CX   is
               overwritten with C*X + S*Y.

     INCX      (input) INTEGER
               The increment between  successive  values  of  CY.
               INCX <> 0.

     CY        (input/output) COMPLEX*16 array, dimension (N)
               On  input,  the  vector  Y.   On  output,  CY   is
               overwritten with -CONJG(S)*X + C*Y.

     INCY      (input) INTEGER
               The increment between  successive  values  of  CY.
               INCX <> 0.

     C         (input) DOUBLE PRECISION

     S         (input) COMPLEX*16
               C and S define a rotation
               [  C          S  ]
               [ -conjg(S)   C  ]
               where C*C + S*CONJG(S) = 1.0.

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