UMFPACK is a set of routines for solving unsymmetric sparse linear systems, Ax=b, using the Unsymmetric MultiFrontal method. Written in ANSI/ISO C, with a MATLAB (Version 6.0 and later) interface.
Appears as a built-in routine (for lu, backslash, and forward slash) in MATLAB. 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".
UMFPACK 3.2 through 5.1 is available under a LGPL license. UMFPACK 5.2 (and future versions) are available under the GPL license. For a non-GNU license, please contact Tim Davis.
· BLAS package (program runs considerably slower without this)
To compile, test, and install both UMFPACK and AMD, the UMFPACK and AMD directories must be in the same parent directory. To configure, edit the UFconfig/UFconfig.mk file (otherwise, you may get warnings that the BLAS (dgemm, etc) are not found). You may use UMFPACK_CONFIG = -DNBLAS in the UFconfig/UFconfig.mk file, to avoid using the BLAS, but UMFPACK will be slow. Next, cd to this directory (UMFPACK) and type "make". To compile and run a FORTRAN demo program for Harwell/Boeing matrices, type "make hb". To compile a FORTRAN main program that calls the 32-bit C-callable UMFPACK library, type "make fortran". When done, type "make clean" to remove unused *.o files (keeps the compiled libraries and demo programs). See the User Guide (Doc/UserGuide.pdf), or ../UFconfig/UFconfig.mk for more details (including options for compiling in 64-bit mode).