SUBROUTINE CSROT(N,CX,INCX,CY,INCY,C,S)
C***BEGIN PROLOGUE  CSROT
C***DATE WRITTEN   810223   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  D1B10
C***KEYWORDS  BLAS,COMPLEX,LINEAR ALGEBRA,PLANE ROTATION,VECTOR
C***AUTHOR  DONGARRA, J., (ANL)
C***PURPOSE  Applies a plane rotation to complex vectors.
C***DESCRIPTION
C
C     CSROT applies the complex Givens rotation
C
C          (X)   ( C S)(X)
C          (Y) = (-S C)(Y)
C
C     N times where for I = 0,...,N-1
C
C          X = CX(1+I*INCX)
C          Y = CY(1+I*INCY)
C
C     Argument Description
C
C        N      (integer)  number of elements in each vector
C
C        CX     (complex array)  beginning of one vector
C
C        INCX   (integer)  memory spacing of successive elements
C               of vector CX
C
C        CY     (complex array)  beginning of the other vector
C
C        INCY   (integer)  memory spacing of successive elements
C               of vector CY
C
C        C      (real)  cosine term of the rotation
C
C        S      (real)  sine term of the rotation.
C***REFERENCES  DONGARRA J.J., BUNCH J.R., MOLER C.B., STEWART G.W.,
C                 *LINPACK USERS  GUIDE*, SIAM, 1979.
C***ROUTINES CALLED  (NONE)
C***END PROLOGUE  CSROT