File: test6.m

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rand ('state', 0)
maxerr = 0 ;
clf
for trial = 1:201
    n = fix (100 * rand (1)) ;
    d = 0.1 * rand (1) ;
    L = tril (sprandn (n,n,d),-1) + speye (n) ;
    b = sprandn (n,1,d) ;

    x = L\b ;
    sr = 1 + cs_reachr (L,b) ;
    sz = 1 + cs_reachr (L,b) ;

    same (sr,sz) ;

    s2 = 1 + cs_reach (L,b) ;
    x2 = cs_splsolve (L,b) ;

    spy ([L b x x2])

    s = sort (sr) ;
    [i j xx] = find (x) ;

    if (isempty (i))
	if (~isempty (s))
	    error ('!') ;
	end
    elseif (any (s ~= i))
	error ('!') ;
    end

    if (any (s2 ~= sr))
	error ('!') ;
    end

    err = norm (x-x2,1) ;
    if (err > 1e-12)
	error ('!') 
    end

    maxerr = max (maxerr, err) ;

    drawnow
end
maxerr