```      DOUBLE PRECISION FUNCTION DASUM(N,DX,INCX)
*     .. Scalar Arguments ..
INTEGER INCX,N
*     ..
*     .. Array Arguments ..
DOUBLE PRECISION DX(*)
*     ..
*
*  Purpose
*  =======
*
*     takes the sum of the absolute values.
*     jack dongarra, linpack, 3/11/78.
*     modified 3/93 to return if incx .le. 0.
*     modified 12/3/93, array(1) declarations changed to array(*)
*
*
*     .. Local Scalars ..
DOUBLE PRECISION DTEMP
INTEGER I,M,MP1,NINCX
*     ..
*     .. Intrinsic Functions ..
INTRINSIC DABS,MOD
*     ..
DASUM = 0.0d0
DTEMP = 0.0d0
IF (N.LE.0 .OR. INCX.LE.0) RETURN
IF (INCX.EQ.1) GO TO 20
*
*        code for increment not equal to 1
*
NINCX = N*INCX
DO 10 I = 1,NINCX,INCX
DTEMP = DTEMP + DABS(DX(I))
10 CONTINUE
DASUM = DTEMP
RETURN
*
*        code for increment equal to 1
*
*
*        clean-up loop
*
20 M = MOD(N,6)
IF (M.EQ.0) GO TO 40
DO 30 I = 1,M
DTEMP = DTEMP + DABS(DX(I))
30 CONTINUE
IF (N.LT.6) GO TO 60
40 MP1 = M + 1
DO 50 I = MP1,N,6
DTEMP = DTEMP + DABS(DX(I)) + DABS(DX(I+1)) + DABS(DX(I+2)) +
+            DABS(DX(I+3)) + DABS(DX(I+4)) + DABS(DX(I+5))
50 CONTINUE
60 DASUM = DTEMP
RETURN
END

```