Source module last modified on Thu, 2 Jul 1998, 23:17;
HTML image of Fortran source automatically generated by
for2html on Sun, 23 Jun 2002, 15:10.
double precision function dasum(n,dx,incx)
#
# 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(*)
#
double precision dx(*),dtemp
integer i,incx,m,mp1,n,nincx
#
dasum = 0.0d0
dtemp = 0.0d0
if( n<=0 || incx<=0 )return
if(incx==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 == 0 ) go to 40
do 30 i = 1,m
dtemp = dtemp + dabs(dx(i))
30 continue
if( n < 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