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psblas3/base/serial/f77/snumbmm.f

86 lines
2.3 KiB
FortranFixed

c == =====================================================================
c Sparse Matrix Multiplication Package
c
c Randolph E. Bank and Craig C. Douglas
c
c na.bank@na-net.ornl.gov and na.cdouglas@na-net.ornl.gov
c
c Compile this with the following command (or a similar one):
c
c f77 -c -O smmp.f
c
c == =====================================================================
subroutine snumbmm(n, m, l,
* ia, ja, diaga, a,
* ib, jb, diagb, b,
* ic, jc, diagc, c,
* temp)
use psb_const_mod
c
integer(psb_ipk_) :: ia(*), ja(*), diaga,
* ib(*), jb(*), diagb,
* ic(*), jc(*), diagc
c
real(psb_spk_) :: a(*), b(*), c(*), temp(*),ajj
c
c numeric matrix multiply c=a*b
c
maxlmn = max(l,m,n)
do 10 i = 1,maxlmn
temp(i) = 0.
10 continue
minlm = min(l,m)
minln = min(l,n)
minmn = min(m,n)
c
c c = a*b
c
do 50 i = 1,n
do 30 jj = ia(i),ia(i+1)
c a = d + ...
if (jj.eq.ia(i+1)) then
if (diaga.eq.0 .or. i.gt.minmn) goto 30
j = i
ajj = a(i)
else
j=ja(jj)
ajj = a(jj)
endif
c b = d + ...
if (diagb.eq.1 .and. j.le.minlm)
* temp(j) = temp(j) + ajj * b(j)
if ((j<1).or.(j>m)) then
write(psb_err_unit,*)
+ ' NUMBMM: Problem with A ',i,jj,j,m
endif
do 20 k = ib(j),ib(j+1)-1
if((jb(k)<1).or. (jb(k) > maxlmn)) then
write(psb_err_unit,*)
+ ' NUMBMM: jb problem',j,k,jb(k),maxlmn
else
temp(jb(k)) = temp(jb(k)) + ajj * b(k)
endif
20 continue
30 continue
c c = d + ...
if (diagc.eq.1 .and. i.le.minln) then
c(i) = temp(i)
temp(i) = 0.
endif
c$$$ if (mod(i,100) == 1)
c$$$ + write(psb_err_unit,*)
c$$$ ' NUMBMM: Fixing row ',i,ic(i),ic(i+1)-1
do 40 j = ic(i),ic(i+1)-1
if((jc(j)<1).or. (jc(j) > maxlmn)) then
write(psb_err_unit,*)
+ ' NUMBMM: output problem',i,j,jc(j),maxlmn
else
c(j) = temp(jc(j))
temp(jc(j)) = 0.
endif
40 continue
50 continue
return
end