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function test3
%test3: KLU test
% Example:
% test3
% See also klu
% KLU, Copyright (c) 2004-2022, University of Florida. All Rights Reserved.
% Authors: Timothy A. Davis and Ekanathan Palamadai.
% SPDX-License-Identifier: LGPL-2.1+
h = waitbar (1/12, 'KLU test 3 of 5') ;
% rand ('state', 0) ;
load west0479
A = west0479 ;
% A = sparse (rand (4)) ;
% A (3:4, 1:2) = 0 ;
n = size (A,1) ;
b = rand (n,1) ;
spparms ('spumoni',2)
x = A\b ;
spparms ('spumoni',0)
fprintf ('MATLAB resid %g\n', norm (A*x-b,1)) ;
[LU,info,cond_estimate] = klu (A) ;
fprintf ('\nLU = \n') ; disp (LU) ;
fprintf ('\ninfo = \n') ; disp (info) ;
fprintf ('KLU condest %g\n', cond_estimate) ;
matlab_condest = condest (A) ;
matlab_cond = cond (full (A)) ;
fprintf ('MATLAB condest %g cond %g\n', matlab_condest, matlab_cond) ;
for nrhs = 1:10
waitbar (nrhs/12, h) ;
b = rand (n,nrhs) ;
x = klu (LU,'\',b) ;
fprintf ('nrhs: %d resid: %g\n', ...
nrhs, norm (A*x-b,1) / norm (A,1)) ;
end
[x,info,cond_estimate] = klu (A, '\', b) ; %#ok
fprintf ('\ninfo = \n') ; disp (info) ;
fprintf ('KLU cond_estimate %g\n', cond_estimate) ;
waitbar (11/12, h) ;
[x,info] = klu (A, '\', b, struct ('ordering',1)) ; %#ok
fprintf ('\ninfo = \n') ; disp (info) ;
[x,info,cond_estimate] = klu (A, '\', b, struct ('ordering',2)) ; %#ok
fprintf ('\ninfo = \n') ; disp (info) ;
try
[x,info,cond_estimate] = klu (A, '\', b, struct ('ordering',3)) ; %#ok
fprintf ('\ninfo = \n') ; disp (info) ;
[x,info,cond_estimate] = klu (A, '\', b, struct ('ordering',4)) ; %#ok
fprintf ('\ninfo = \n') ; disp (info) ;
catch me
disp (me.message) ;
fprintf ('test with CHOLMOD skipped (CHOLMOD or METIS not installed)\n') ;
end
close (h) ;
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