File: README.txt

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CHOLMOD: a sparse CHOLesky MODification package 
-----------------------------------------------

    CHOLMOD is a set of routines for factorizing sparse symmetric positive
    definite matrices of the form A or AA', updating/downdating a sparse
    Cholesky factorization, solving linear systems, updating/downdating
    the solution to the triangular system Lx=b, and many other sparse matrix
    functions for both symmetric and unsymmetric matrices.  Its supernodal
    Cholesky factorization relies on LAPACK and the Level-3 BLAS, and obtains
    a substantial fraction of the peak performance of the BLAS.  Both real and
    complex matrices are supported.  CHOLMOD is written in ANSI/ISO C, with both
    C and MATLAB interfaces.  This code works on Microsoft Windows and many
    versions of Unix and Linux.

Version 1.0.2, Jan 18, 2006.  Copyright (c) 2005-2006.

Some Modules of CHOLMOD are copyrighted by the University of Florida.  Most are
copyrighted by the authors: Timothy A. Davis (all of them), and William W. Hager
(the Modify Module).

CHOLMOD relies on several other packages:  AMD, COLAMD, CCOLAMD, METIS,
the BLAS, and LAPACK.

AMD is authored by T. Davis, Iain Duff, and Patrick Amestoy.
COLAMD is authored by T. Davis and Stefan Larimore, with algorithmic design
in collaboration with John Gilbert and Esmond Ng.
CCOLAMD is authored by T. Davis and Siva Rajamanickam.

LAPACK and the BLAS are authored by Jack Dongarra and many others.
LAPACK is available at http://www.netlib.org/lapack

METIS is authored by George Karypis, Univ. of Minnesota.  Its use in CHOLMOD
is optional.  See http://www-users.cs.umn.edu/~karypis/metis.
Place a copy of the metis-4.0 directory in the same directory that
contains the CHOLMOD, AMD, COLAMD, and CCOLAMD directories.  Then do:
    cd metis-4.0 ; make
You may then compile CHOLMOD.

The CHOLMOD, AMD, COLAMD, CCOLAMD, and UFconfig directories must all reside
in a common parent directory.  To compile all these libraries,
edit UFconfig/UFconfig.mk to reflect your environment (C compiler, location
of the BLAS, and so on) and then type "make" in either the CHOLMOD directory
or in the parent directory of CHOLMOD.  See each package for more details on
how to compile them.

For use in MATLAB (on any system, including Windows):  start MATLAB,
cd to the CHOLMOD/MATLAB directory, and type cholmod_make in the MATLAB
Command Window.

On the Pentium, do NOT use the Intel MKL BLAS prior to MKL Version 8.0 with
CHOLMOD.  Older versions (prior to 8.0) have a bug in dgemm when computing
A*B'.  The bug generates a NaN result, when the inputs are well-defined.  Use
the Goto BLAS or the MKL v8.0 BLAS instead.  The Goto BLAS is faster and more
reliable.  See http://www.tacc.utexas.edu/~kgoto/ or
http://www.cs.utexas.edu/users/flame/goto/.
Sadly, the Intel MKL BLAS 7.x is the default for MATLAB 7.0.4.  See
http://www.mathworks.com/support/bugreports/details.html?rp=252103 for more
details.  To workaround this problem on Linux, set environment variable
BLAS_VERSION to libmkl_p3.so:libguide.so. On Windows, set environment variable
BLAS_VERSION to mkl_p3.dll.  Better yet, get MATLAB 7sp3 (MATLAB 7.1).

Acknowledgements:  this work was supported in part by the National Science
Foundation (NFS CCR-0203270 and DMS-9803599), and a grant from Sandia National
Laboratories (Dept. of Energy) which supported the development of CHOLMOD's
Partition Module.