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diff --git a/math/umfpack/pkg-descr b/math/umfpack/pkg-descr new file mode 100644 index 000000000000..1668614f29a1 --- /dev/null +++ b/math/umfpack/pkg-descr @@ -0,0 +1,36 @@ +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). + +For more information +-------------------- + +For more information, see T. A. Davis and I. S. Duff, "An +unsymmetric-pattern multifrontal method for sparse LU factorization", +SIAM J. Matrix Analysis and Applications (to appear), also +technical report TR-94-038, CISE Dept., Univ. of Florida, +P.O. Box 116120, Gainesville, FL 32611-6120, USA. The method used +here is a modification of that method, described in T. A. Davis, +"A combined unifrontal/multifrontal method for unsymmetric sparse +matrices," TR-94-005, and in T. A. Davis and I. S. Duff, (same title), +TR-95-020. (Technical reports are available via WWW at +http://www.cis.ufl.edu/). The (unsymmetric) approximate degree update +algorithm used here has been incorporated into a symmetric approximate +minimum degree ordering algorithm, described in P. Amestoy, T. A. Davis, +and I. S. Duff, "An approximate minimum degree ordering algorithm", +SIAM Journal on Matrix Analysis and Applications (to appear, also TR-94-039). +The approximate minimum degree ordering algorithm is implemented as MC47 +in the Harwell Subroutine Library (MC47 is not used in UMFPACK). +Also take a look at our World Wide Web home pages: + Tim Davis: http://www.cis.ufl.edu/~davis + (also email: davis@cis.ufl.edu). + Iain Duff: http://www.cis.rl.ac.uk/people/isd/contact.html +______________ + Timothy A. Davis and Iain S. Duff. Copyright (C) 1997. |