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function test22
%TEST22 test cond1est
%
% Example:
% test22
% See also: testall
% CSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
% SPDX-License-Identifier: LGPL-2.1+
index = ssget ;
[ignore f] = sort (max (index.nrows, index.ncols)) ;
f = f (1:200) ;
clf
% f = f(1)
nprob = length (f) ;
C1 = zeros (nprob,1) ;
C2 = zeros (nprob,1) ;
C3 = zeros (nprob,1) ;
for k = 1:length (f)
i = f (k) ;
Prob = ssget (i) ;
disp (Prob) ;
A = Prob.A ;
[m n] = size (A) ;
if (~isreal (A) | m ~= n) %#ok
continue
end
c1 = condest (A) ;
c2 = cond1est (A) ;
if (c1 == c2)
err = 0 ;
else
err = (c1-c2)/max(1,c1) ;
end
c3 = cond (full (A), 1) ;
fprintf ('%10.4e %10.4e (%10.4e) : %10.4e\n', c1, c2, c3, err) ;
if (err ~= 0)
% pause
end
C1 (k) = c1 ;
C2 (k) = c2 ;
C3 (k) = c3 ;
subplot (1,2,1) ;
loglog (C1, C2, 'x', [1 1e20], [1 1e20], 'r') ;
subplot (1,2,2) ;
loglog (C3, C2, 'x', [1 1e20], [1 1e20], 'r') ;
drawnow
% pause
% if (c3 < c2)
% c3
% c2
% c2-c3
% pause
% end
end
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