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file doc for documentation for the package size 125 kilobytes file y12m.f y12m.f plus dependencies for solution of linear systems, matrices are large and sparse file y12mae.f y12mae.f plus dependencies for sparse matrix, solve one system, single right hand side prec single file y12maf.f y12maf.f plus dependencies for sparse matrix, solve one system, single right hand side prec double file y12mfe.f y12mfe.f plus dependencies for Solves a large sparse system of linear algebraic equations , using Gaussian elimination and sparse matrix techniques. , Iterative refinement is applied in order to improve accuracy. gams d2a4 lib ex for test programs