UMFPACK

UMFPACK
Developer(s) Timothy A. Davis
Initial release January 1994
Stable release
5.7.4 / February 1, 2016 (2016-02-01)
Development status Active
Written in C
Operating system Cross-platform
Type Mathematics, Linear Algebra
License GNU Lesser General Public License or BSD License
Website http://faculty.cse.tamu.edu/davis/suitesparse.html

UMFPACK /ˈʌmfpæk/ is a set of routines for solving unsymmetric sparse linear systems of the form Ax=b, using the Unsymmetric MultiFrontal method (Matrix A is not required to be symmetric). Written in ANSI/ISO C and interfaces with

It appears as a built-in routine (for lu, backslash, and forward slash) in MATLAB, and includes a MATLAB interface, a C-callable interface, and a Fortran-callable interface. Note that "UMFPACK" is pronounced in two syllables, "Umph Pack". It is not "You Em Ef Pack" .

The BLAS: Basic Linear Algebra Subprograms

UMFPACK has installation options to use the many versions of the BLAS, or no BLAS at all. The BLAS is what UMFPACK relies on to get high performance on a wide range of computers. If at all possible, use the BLAS. If your BLAS uses 64-bit integers, compile with -DBLAS64. You can also edit the UFconfig.h (SuiteSparse_config.h starting from version 4.0.0) file as needed to include this definition.

History

The license of UMFPACK has changed in the last two years from a BSD license to LGPL, and finally in the last version 5.2 to a GPL license. Some versions of the software have been retroactively placed under the LGPL, so different licensed versions can be found.

This article is issued from Wikipedia - version of the 9/21/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.