zcopy.f

          SUBROUTINE ZCOPY(N,ZX,INCX,ZY,INCY)
    *     .. Scalar Arguments ..
          INTEGER INCX,INCY,N
    *     ..
    *     .. Array Arguments ..
          DOUBLE COMPLEX ZX(*),ZY(*)
    *     ..
    *
    *  Purpose
    *  =======
    *
    *     copies a vector, x, to a vector, y.
    *     jack dongarra, linpack, 4/11/78.
    *     modified 12/3/93, array(1) declarations changed to array(*)
    *
    *
    *     .. Local Scalars ..
          INTEGER I,IX,IY
    *     ..
          IF (N.LE.0) RETURN
          IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
    *
    *        code for unequal increments or equal increments
    *          not equal to 1
    *
          IX = 1
          IY = 1
          IF (INCX.LT.0) IX = (-N+1)*INCX + 1
          IF (INCY.LT.0) IY = (-N+1)*INCY + 1
          DO 10 I = 1,N
              ZY(IY) = ZX(IX)
              IX = IX + INCX
              IY = IY + INCY
       10 CONTINUE
          RETURN
    *
    *        code for both increments equal to 1
    *
       20 DO 30 I = 1,N
              ZY(I) = ZX(I)
       30 CONTINUE
          RETURN
          END