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ME42 Sparse unsymmetric system: out-of-core frontal method

To solve one or more sets of sparse linear complex equations, Ax = b, ATx = b or AHx = b, by the frontal method, optionally using direct-access files for the matrix factors so that large problems can be solved in a relatively small in-core memory (AHx = b is the transpose of the complex conjugate of A). Use is made of high level BLAS kernels. The code has low in-core memory requirements. The complex matrix A may be input by the user in either of the following ways:

(i) by elements in a finite-element calculation,
(ii) by equations (matrix rows).