double precision function dasum(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
dasum = 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
dasum = 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 dasum = dtemp
return
end
