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zlacrt

 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( * )

 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 overwrit-
              ten 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 overwrit-
              ten 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 complex
              rotation [  C   S  ] [ -S   C  ] where C*C + S*S =
              1.0.