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UMFPACK Version 2.2 is a package for solving systems of sparse linear systems,
Ax=b, where A is sparse and can be unsymmetric. It is written in ANSI Fortran
77. There are options for choosing a good pivot order, factorizing a
subsequent matrix with the same pivot order and nonzero pattern as a
previously factorized matrix, and solving systems of linear equations with
the factors (with A, L, or U; or with their transposes in the single/double
precision versions). Iterative refinement, with sparse backward error
estimates, can be performed. Single and double precision, complex, and
complex double precision (complex*16) routines are available. (Note that
complex*16 is not ANSI Fortran-77, but is a common extension to it).
WWW: http://www.cise.ufl.edu/~davis/umfpack.html
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