File: test18.m

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ufsparse 1.2-7
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clear
index = UFget ;
[ignore f] = sort (max (index.nrows, index.ncols)) ;
f = f (1:100) ;

clf
% f = f(1)

for i = f
    Prob = UFget (i)
    A = Prob.A ;
    [m n] = size (A) ;
    if (~isreal (A) || m ~= n)
	continue
    end

    b = rand (n,1) ;
    x = A\b ;
    r = b - A*x ;
    x = x + A\r ;

    fprintf ('\n%6.2e to %6.2e\n', norm (r), norm (b-A*x)) ;
end