double precision function dzasum(n,zx,incx)
c
c     takes the sum of the absolute values.
c     jack dongarra, 3/11/78.
c     modified to correct problem with negative increment, 8/21/90.
c
      double complex zx(1)
      double precision stemp,dcabs1
      integer i,incx,ix,n
c
      dzasum = 0.0d0
      stemp = 0.0d0
      if(n.le.0)return
      if(incx.eq.1)go to 20
c
c        code for increment not equal to 1
c
      ix = 1
      if(incx.lt.0)ix = (-n+1)*incx + 1
      do 10 i = 1,n
        stemp = stemp + dcabs1(zx(ix))
        ix = ix + incx
   10 continue
      dzasum = stemp
      return
c
c        code for increment equal to 1
c
   20 do 30 i = 1,n
        stemp = stemp + dcabs1(zx(i))
   30 continue
      dzasum = stemp
      return
      end