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NAME
     zlacrt - apply a plane rotation, where the cos  and  sin  (C
     and S) are complex and the vectors CX and CY are complex

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

     INTEGER INCX, INCY, N

     COMPLEX*16 C, S

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



     #include <sunperf.h>

     void zlacrt(int n, doublecomplex *cx, int  incx,  doublecom-
               plex  *cy, int incy, doublecomplex *zc, doublecom-
               plex *s) ;

PURPOSE
     ZLACRT applies a plane rotation, where the cos  and  sin  (C
     and S) are 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 -S*X + C*Y.

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

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

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