File: tp.m

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ufsparse 1.2-7
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rand ('state', 0)

for trial = 1:100
    m = fix (30 * rand (1)) ;
    n = fix (30 * rand (1)) ;
    d = rand (1) ;
    A = sprandn (m,n,d) ;

    if (m == 0)
	p = [] ;
    else
	p = randperm (m) ;
    end
    if (n == 0)
	q = [] ;
    else
	q = randperm (n) ;
    end

    C = A(p,q) ;

    Im = speye (m) ;
    In = speye (n) ;
    P = Im (p,:) ;
    Q = In (:,q) ;

    [q2 x x] = find (Q) ;
    if (any (q ~= q2'))
	error ('!') 
    end

    [p2 x x] = find (P') ;
    if (any (p ~= p2'))
	error ('!') 
    end

    E = P*A*Q ;
    if (norm (C-E,1) ~= 0)
	error ('!') 
    end

    P = sparse (1:m, p, 1) ;
    Q = sparse (q, 1:n, 1) ;

    E = P*A*Q ;
    if (norm (C-E,1) ~= 0)
	error ('2!') 
    end

end