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% umfpack_simple: a simple demo of UMFPACK
%
% UMFPACK Version 4.4, Copyright (c) 2005 by Timothy A. Davis.
% All Rights Reserved. Type umfpack_details for License.
%
% UMFPACK License:
%
% Your use or distribution of UMFPACK or any modified version of
% UMFPACK implies that you agree to this License.
%
% THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
% EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
%
% Permission is hereby granted to use or copy this program, provided
% that the Copyright, this License, and the Availability of the original
% version is retained on all copies. User documentation of any code that
% uses UMFPACK or any modified version of UMFPACK code must cite the
% Copyright, this License, the Availability note, and "Used by permission."
% Permission to modify the code and to distribute modified code is granted,
% provided the Copyright, this License, and the Availability note are
% retained, and a notice that the code was modified is included. This
% software was developed with support from the National Science Foundation,
% and is provided to you free of charge.
%
% Availability: http://www.cise.ufl.edu/research/sparse/umfpack
%
% See also: umfpack, umfpack_details
help umfpack_simple
i = input ('Hit enter to agree to the above License: ', 's') ;
if (~isempty (i))
error ('terminating') ;
end
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
]
A = sparse (A) ;
b = [8 45 -3 3 19]'
fprintf ('Solution to Ax=b via UMFPACK:\n') ;
fprintf ('x1 = umfpack (A, ''\\'', b)\n') ;
x1 = umfpack (A, '\', b)
fprintf ('Solution to Ax=b via MATLAB:\n') ;
fprintf ('x2 = A\\b\n') ;
x2 = A\b
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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