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Tue Nov 8 23:53:35 2005 UTC (13 years, 11 months ago) by bates
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Tue Nov 8 23:53:35 2005 UTC (13 years, 11 months ago) by bates
File size: 5716 byte(s)
Merging from trunk
CCOLAMD version 1.0: constrained column approximate minimum degree ordering Copyright (C) 2005, Univ. of Florida. Authors: Timothy A. Davis, Sivasankaran Rajamanickam, and Stefan Larimore. Closely based on COLAMD by Davis, Stefan Larimore, in collaboration with Esmond Ng, and John Gilbert. http://www.cise.ufl.edu/research/sparse ------------------------------------------------------------------------------- The CCOLAMD column approximate minimum degree ordering algorithm computes a permutation vector P such that the LU factorization of A (:,P) tends to be sparser than that of A. The Cholesky factorization of (A (:,P))'*(A (:,P)) will also tend to be sparser than that of A'*A. CSYMAMD is a symmetric minimum degree ordering method based on CCOLAMD, also available as a MATLAB-callable function. It constructs a matrix M such that M'*M has the same pattern as A, and then uses CCOLAMD to compute a column ordering of M. To compile and test the colamd m-files and mexFunctions, just unpack the CCOLAMD/ directory from the CCOLAMD.tar.gz file, and run MATLAB from within that directory. Next, type ccolamd_test to compile and test ccolamd and csymamd. This will work on any computer with MATLAB (Unix, PC, or Mac). Alternatively, type "make" (in Unix) to compile and run a simple example C code, and to compile the C-callable library (libccolamd.a). Other "make" targets: make matlab compiles MATLAB mexFunctions only make libccolamd.a compiles a C-callable library containing ccolamd make clean removes all files not in the distribution, except for libccolamd.a make distclean removes all files not in the distribution To use ccolamd and csymamd within an application written in C, all you need are colamd.c and colamd.h, which are the C-callable ccolamd/csymamd codes. See ccolamd.c for more information on how to call ccolamd from a C program. It contains a complete description of the C-interface to CCOLAMD and CSYMAMD. Copyright (c) 1998-2005 by the University of Florida. All Rights Reserved. Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. ------------------------------------------------------------------------------- This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ------------------------------------------------------------------------------- Related papers: T. A. Davis, W. W. Hager, and S. Rajamanickam, Multiple-rank updates to a supernodal sparse Cholesky factorization, under preparation. T. A. Davis, W. W. Hager, and S. Rajamanickam, CHOLMOD: a sparse Cholesky update/downdate package, under preparation. CHOLMOD's nested dissection ordering relies on CCOLAMD and CSYMAMD to order the matrix after graph partitioning is used to find the ordering constraints. T. A. Davis, J. R. Gilbert, S. Larimore, E. Ng, An approximate column minimum degree ordering algorithm, ACM Transactions on Mathematical Software, vol. 30, no. 3., pp. 353-376, 2004. T. A. Davis, J. R. Gilbert, S. Larimore, E. Ng, Algorithm 836: COLAMD, an approximate column minimum degree ordering algorithm, ACM Transactions on Mathematical Software, vol. 30, no. 3., pp. 377-380, 2004. "An approximate minimum degree column ordering algorithm", S. I. Larimore, MS Thesis, Dept. of Computer and Information Science and Engineering, University of Florida, Gainesville, FL, 1998. CISE Tech Report TR-98-016. Available at ftp://ftp.cise.ufl.edu/cis/tech-reports/tr98/tr98-016.ps via anonymous ftp. Approximate Deficiency for Ordering the Columns of a Matrix, J. L. Kern, Senior Thesis, Dept. of Computer and Information Science and Engineering, University of Florida, Gainesville, FL, 1999. Available at http://www.cise.ufl.edu/~davis/Kern/kern.ps Authors: Timothy A. Davis, Sivasankaran Rajamanickam, and Stefan Larimore. Closely based on COLAMD by Stefan I. Larimore and Timothy A. Davis, University of Florida, in collaboration with John Gilbert, Xerox PARC (now at UC Santa Barbara), and Esmong Ng, Lawrence Berkeley National Laboratory (much of this work he did while at Oak Ridge National Laboratory). COLAMD files: CCOLAMD.tar.gz: All files, as a gzipped, Unix tar file. The *.m, and *mex.c files are for use in MATLAB. ccolamd.c: the primary ccolamd computational kernel. ccolamd.h: include file for ccolamd/csymamd library. ccolamd.m: the MATLAB interface to ccolamd. ccolamd_demo.m: MATLAB demo file for ccolamd and csymamd (also compiles the ccolamdmex and csymamdmex mexFunctions). ccolamdmex.c: ccolamd mexFunction for use in MATLAB. ccolamd_example.c: example C main program that calls ccolamd and csymamd ccolamd_example.out: output of ccolamd_example.c. Makefile: Makefile for ccolamd_example.c csymamd.m: the MATLAB interface to csymamd. csymamdmex.c: csymamd mexFunction for use in MATLAB. README: this file ChangeLog: a log of changes since Version 1.0. ccolamd_test.m: test code ccolamdtestmex.c: test code luflops.m: test code csymamdtestmex.c: test code lesser.txt: a verbatim copy of the GNU LGPL Version 2.1 license
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