17 lines
410 B
Fortran
17 lines
410 B
Fortran
SUBROUTINE sprstx(sa,ija,x,b,n)
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INTEGER n,ija(*)
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REAL b(n),sa(*),x(n)
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INTEGER i,j,k
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if (ija(1).ne.n+2) pause 'mismatched vector and matrix in sprstx'
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do 11 i=1,n
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b(i)=sa(i)*x(i)
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11 continue
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do 13 i=1,n
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do 12 k=ija(i),ija(i+1)-1
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j=ija(k)
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b(j)=b(j)+sa(k)*x(i)
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12 continue
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13 continue
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return
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END
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