CROT  - applie a plane rotation, where the cos (C) is real
       and the sin (S) is complex, and the vectors CX and CY  are
       complex


SYNOPSIS

       SUBROUTINE CROT( N, CX, INCX, CY, INCY, C, S )

           INTEGER      INCX, INCY, N

           REAL         C

           COMPLEX      S

           COMPLEX      CX( * ), CY( * )


PURPOSE

       CROT  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 array, dimension (N)
               On  input,  the  vector X.  On output, CX is over­
               written with C*X + S*Y.

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

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

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

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


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