/[ascend]/trunk/blas/dasum.f
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Contents of /trunk/blas/dasum.f

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Revision 1 - (show annotations) (download)
Fri Oct 29 20:54:12 2004 UTC (15 years, 8 months ago) by aw0a
File size: 1135 byte(s)
Setting up web subdirectory in repository
1 C dasum.f
2 C is freely available from netlib. It is not subject to any GNU License
3 C set by the authors of the ASCEND math programming system.
4 C $Date: 1996/04/30 18:14:07 $ $Revision: 1.1.1.1 $
5 C
6 double precision function dasum(n,dx,incx)
7 c
8 c takes the sum of the absolute values.
9 c jack dongarra, linpack, 3/11/78.
10 c
11 double precision dx(*),dtemp
12 integer i,incx,m,mp1,n,nincx
13 c
14 dasum = 0.0d0
15 dtemp = 0.0d0
16 if(n.le.0)return
17 if(incx.eq.1)go to 20
18 c
19 c code for increment not equal to 1
20 c
21 nincx = n*incx
22 do 10 i = 1,nincx,incx
23 dtemp = dtemp + dabs(dx(i))
24 10 continue
25 dasum = dtemp
26 return
27 c
28 c code for increment equal to 1
29 c
30 c
31 c clean-up loop
32 c
33 20 m = mod(n,6)
34 if( m .eq. 0 ) go to 40
35 do 30 i = 1,m
36 dtemp = dtemp + dabs(dx(i))
37 30 continue
38 if( n .lt. 6 ) go to 60
39 40 mp1 = m + 1
40 do 50 i = mp1,n,6
41 dtemp = dtemp + dabs(dx(i)) + dabs(dx(i + 1)) + dabs(dx(i + 2))
42 * + dabs(dx(i + 3)) + dabs(dx(i + 4)) + dabs(dx(i + 5))
43 50 continue
44 60 dasum = dtemp
45 return
46 end
47

john.pye@anu.edu.au
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