home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Cream of the Crop 26
/
Cream of the Crop 26.iso
/
os2
/
octa209s.zip
/
octave-2.09
/
libcruft
/
blas
/
dzasum.f
< prev
next >
Wrap
Text File
|
1997-01-29
|
795b
|
35 lines
double precision function dzasum(n,zx,incx)
c
c takes the sum of the absolute values.
c jack dongarra, 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 complex zx(*)
double precision stemp,dcabs1
integer i,incx,ix,n
c
dzasum = 0.0d0
stemp = 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
ix = 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