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function test12
%TEST12 test cs_qr and compare with svd
%
% Example:
% test12
% See also: testall
% Copyright 2006-2007, Timothy A. Davis.
% http://www.cise.ufl.edu/research/sparse
fprintf ('test 12\n') ;
rand ('state',0) ;
% A = rand (3,4)
for trial = 1:100
m = fix (100 * rand (1)) ;
n = fix (100 * rand (1)) ;
d = .1 * rand (1) ;
A = sprandn (m,n,d) ;
fprintf ('m %d n %d nnz %d\n', m, n, nnz(A)) ;
if (m < n)
continue ;
end
if (m == 0 | n == 0) %#ok
continue ;
end
% save A A
fprintf ('[ ') ;
[V,Beta,p,R] = cs_qr (A) ;
% [Q,R] = svd (full(A)) ;
fprintf (']\n') ;
s1 = svd (full (A)) ;
s2 = svd (full (R)) ;
s2 = s2 (1:length(s1)) ;
err = norm (s1-s2) ;
if (length (s1) > 1)
err = err / s1 (1) ;
end
fprintf ('err %g\n', err) ;
if (err > 1e-12)
error ('!') ;
end
end
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