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%UMFPACK_SIMPLE a simple demo
%
% Example:
% umfpack_simple
%
% Copyright 1995-2007 by Timothy A. Davis.
%
% UMFPACK License:
%
% Your use or distribution of UMFPACK or any modified version of
% UMFPACK implies that you agree to this License. UMFPACK is
% 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.
% Availability: http://www.cise.ufl.edu/research/sparse/umfpack
%
% See also: umfpack, umfpack2, umfpack_details
help umfpack_simple
format short
A = [
2 3 0 0 0
3 0 4 0 6
0 -1 -3 2 0
0 0 1 0 0
0 4 2 0 1
] ;
fprintf ('A = \n') ; disp (A) ;
A = sparse (A) ;
b = [8 45 -3 3 19]' ;
fprintf ('b = \n') ; disp (b) ;
fprintf ('Solution to Ax=b via UMFPACK:\n') ;
fprintf ('x1 = umfpack2 (A, ''\\'', b)\n') ;
x1 = umfpack2 (A, '\', b) ;
fprintf ('x1 = \n') ; disp (x1) ;
fprintf ('Solution to Ax=b via MATLAB:\n') ;
fprintf ('x2 = A\\b\n') ;
x2 = A\b ;
fprintf ('x2 = \n') ; disp (x2) ;
fprintf ('norm (x1-x2) should be small: %g\n', norm (x1-x2)) ;
fprintf ('Type ''umfpack_demo'' for a full demo of UMFPACK\n') ;
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