Keyword : Matrix, sparse

F01BRF	$L U$ factorization of real sparse matrix
F01BSF	$L U$ factorization of real sparse matrix with known sparsity pattern
F02SDF	Eigenvector of generalized real banded eigenproblem by inverse iteration
F04AXF	Solution of real sparse simultaneous linear equations (coefficient matrix already factorized)
F04JGF	Least squares (if rank $= n$ ) or minimal least squares (if rank $< n$ ) solution of $m$ real equations in $n$ unknowns, $m \geq n$