subroutine nnsc * (n, r, c, il, jl, ijl, l, d, iu, ju, iju, u, z, b, tmp) clll. optimize c*** subroutine nnsc c*** numerical solution of sparse nonsymmetric system of linear c equations given ldu-factorization (compressed pointer storage) c c c input variables.. n, r, c, il, jl, ijl, l, d, iu, ju, iju, u, b c output variables.. z c c parameters used internally.. c fia - tmp - temporary vector which gets result of solving ly = b. c - size = n. c c internal variables.. c jmin, jmax - indices of the first and last positions in a row of c u or l to be used. c integer r(1), c(1), il(1), jl(1), ijl(1), iu(1), ju(1), iju(1) double precision l(1), d(1), u(1), b(1), z(1), tmp(1), tmpk,sum c c ****** set tmp to reordered b ************************************* do 1 k=1,n 1 tmp(k) = b(r(k)) c ****** solve ly = b by forward substitution ********************* do 3 k=1,n jmin = il(k) jmax = il(k+1) - 1 tmpk = -d(k) * tmp(k) tmp(k) = -tmpk if (jmin .gt. jmax) go to 3 ml = ijl(k) - jmin do 2 j=jmin,jmax 2 tmp(jl(ml+j)) = tmp(jl(ml+j)) + tmpk * l(j) 3 continue c ****** solve ux = y by back substitution ************************ k = n do 6 i=1,n sum = -tmp(k) jmin = iu(k) jmax = iu(k+1) - 1 if (jmin .gt. jmax) go to 5 mu = iju(k) - jmin do 4 j=jmin,jmax 4 sum = sum + u(j) * tmp(ju(mu+j)) 5 tmp(k) = -sum z(c(k)) = -sum k = k - 1 6 continue return end