!>
!> 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.
!> 

N

!>          N is INTEGER
!>          The number of elements in the vectors CX and CY.
!> 

CX

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

INCX

!>          INCX is INTEGER
!>          The increment between successive values of CX.  INCX <> 0.
!> 

CY

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

INCY

!>          INCY is INTEGER
!>          The increment between successive values of CY.  INCX <> 0.
!> 

C

!>          C is DOUBLE PRECISION
!> 

S

!>          S is 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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