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function test_qr1
%TEST_QR1 test QR factorizations
%
% Example:
% test_qr1
% See also: testall
% CXSparse, 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)) ;
for i = f
Prob = ssget (i,index) ;
A = Prob.A ;
if (~isreal (A))
continue ;
end
[m n] = size (A) ;
if (m < n)
A = A' ;
end
t0 = 0 ;
k0 = 0 ;
while (t0 < 0.1)
tic
q = colamd (A, [-1 10]) ;
% [Q,R] = qr (A (:,q)) ;
R = qr (A (:,q)) ; %#ok
t = toc ;
t0 = t0 + t ;
k0 = k0 + 1 ;
end
t0 = t0 / k0 ;
t1 = 0 ;
k1 = 0 ;
while (t1 < 0.1)
tic
[V,beta, p, R,q] = cs_qr (A) ; %#ok
t = toc ;
t1 = t1 + t ;
k1 = k1 + 1 ;
end
t1 = t1 / k1 ;
fprintf (...
'%25s MATLAB: %10.4f (%8d) CS: %10.4f (%8d) speedup: %8.2f\n', ...
Prob.name, t0, k0, t1, k1, t0/t1) ;
end
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