double precision function dasumf(n,dx,incx)

c

c     takes the sum of the absolute values.

c     jack dongarra, linpack, 3/11/78.

c     modified 3/93 to return if incx .le. 0.

c     modified 12/3/93, array(1) declarations changed to array(*)

c

      double precision dx(*),dtemp

      integer i,incx,m,mp1,n,nincx

c

      dasumf = 0.0d0

      dtemp = 0.0d0

      if( n.le.0 .or. incx.le.0 )return

      if(incx.eq.1)go to 20

c

c        code for increment not equal to 1

c

      nincx = n*incx

      do 10 i = 1,nincx,incx

        dtemp = dtemp + dabs(dx(i))

   10 continue

      dasumf = dtemp

      return

c

c        code for increment equal to 1

c

c

c        clean-up loop

c

   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 dasumf = dtemp

      return

      end