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UMFPACK is a set of routines for solving unsymmetric sparse linear systems, Ax=b, using the Unsymmetric MultiFrontal method. It uses dynamic memory allocation, and has a symbolic preordering and analysis phase that also reports the upper bounds on the nonzeros in L and U, flop count, and memory usage in the numeric phase. It can be used for real and complex matrices, rectangular and square, and both non-singular and singular.


User guide included and available in PDF format from; User quickstart available in PDF format from


Download version 4.4 (stable)
released on 28 January 2005



LicenseVerified byVerified onNotes
BSD 2ClauseJanet Casey30 January 2003

Leaders and contributors

Patrick Amestoy Contributor
Stefan Larimore Contributor
Timothy Davis Maintainer
Steven Hadfield Contributor
Esmond Ng Contributor
Iain Duff Contributor
John Gilbert Contributor

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail
Help,Help Homepage

Software prerequisites

Kind Description
Weak prerequisite BLAS package (program runs considerably slower without this)

This entry (in part or in whole) was last reviewed on 1 July 2008.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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