```      SUBROUTINE DCOPY(N,DX,INCX,DY,INCY)
*     .. Scalar Arguments ..
INTEGER INCX,INCY,N
*     ..
*     .. Array Arguments ..
DOUBLE PRECISION DX(*),DY(*)
*     ..
*
*  Purpose
*  =======
*
*     copies a vector, x, to a vector, y.
*     uses unrolled loops for increments equal to one.
*     jack dongarra, linpack, 3/11/78.
*     modified 12/3/93, array(1) declarations changed to array(*)
*
*
*     .. Local Scalars ..
INTEGER I,IX,IY,M,MP1
*     ..
*     .. Intrinsic Functions ..
INTRINSIC MOD
*     ..
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
DY(IY) = DX(IX)
IX = IX + INCX
IY = IY + INCY
10 CONTINUE
RETURN
*
*        code for both increments equal to 1
*
*
*        clean-up loop
*
20 M = MOD(N,7)
IF (M.EQ.0) GO TO 40
DO 30 I = 1,M
DY(I) = DX(I)
30 CONTINUE
IF (N.LT.7) RETURN
40 MP1 = M + 1
DO 50 I = MP1,N,7
DY(I) = DX(I)
DY(I+1) = DX(I+1)
DY(I+2) = DX(I+2)
DY(I+3) = DX(I+3)
DY(I+4) = DX(I+4)
DY(I+5) = DX(I+5)
DY(I+6) = DX(I+6)
50 CONTINUE
RETURN
END

```