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function test_qrsol
%TEST_QRSOL test cs_qrsol
%
% Example:
% test_qrsol
% See also: testall
% Copyright 2006-2007, Timothy A. Davis.
% http://www.cise.ufl.edu/research/sparse
index = UFget ;
[ignore f] = sort (max (index.nrows, index.ncols)) ;
k = 0 ;
rs1 = zeros (1,0) ;
rs2 = zeros (1,0) ;
for i = f
Prob = UFget (i,index) ;
A = Prob.A ;
if (~isreal (A))
continue ;
end
[m n] = size (A) ; %#ok
b = rand (m,1) ;
x1 = A\b ;
x2 = cs_qrsol (A,b) ;
x1 (~isfinite (x1)) = 0 ;
x2 (~isfinite (x2)) = 0 ;
r1 = norm (A*x1-b) ;
r2 = norm (A*x2-b) ;
k = k + 1 ;
rs1 (k) = r1 ;
rs2 (k) = r2 ;
fprintf ('%30s MATLAB: %6.2e CS: %6.2e\n', Prob.name, r1, r2) ;
loglog (rs1, rs2, 'o') ;
drawnow
clear A b x1 x2
% pack
end
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