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