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    1:       SUBROUTINE ZCOPY(N,ZX,INCX,ZY,INCY)
    2: *     .. Scalar Arguments ..
    3:       INTEGER INCX,INCY,N
    4: *     ..
    5: *     .. Array Arguments ..
    6:       DOUBLE COMPLEX ZX(*),ZY(*)
    7: *     ..
    8: *
    9: *  Purpose
   10: *  =======
   11: *
   12: *     ZCOPY copies a vector, x, to a vector, y.
   13: *
   14: *  Further Details
   15: *  ===============
   16: *
   17: *     jack dongarra, linpack, 4/11/78.
   18: *     modified 12/3/93, array(1) declarations changed to array(*)
   19: *
   20: *  =====================================================================
   21: *
   22: *     .. Local Scalars ..
   23:       INTEGER I,IX,IY
   24: *     ..
   25:       IF (N.LE.0) RETURN
   26:       IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN
   27: *
   28: *        code for both increments equal to 1
   29: *
   30:          DO I = 1,N
   31:           ZY(I) = ZX(I)
   32:          END DO
   33:       ELSE
   34: *
   35: *        code for unequal increments or equal increments
   36: *          not equal to 1
   37: *
   38:          IX = 1
   39:          IY = 1
   40:          IF (INCX.LT.0) IX = (-N+1)*INCX + 1
   41:          IF (INCY.LT.0) IY = (-N+1)*INCY + 1
   42:          DO I = 1,N
   43:             ZY(IY) = ZX(IX)
   44:             IX = IX + INCX
   45:             IY = IY + INCY
   46:          END DO
   47:       END IF
   48:       RETURN
   49:       END