27 lines
553 B
Matlab
27 lines
553 B
Matlab
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% By Willi Mutschler, September 26, 2016. Email: willi@mutschler.eu
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function p = uperm(a)
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[u, ~, J] = unique(a);
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p = u(up(J, length(a)));
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function p = up(J, n)
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ktab = histcounts(J,1:max(J));
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l = n;
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p = zeros(1, n);
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s = 1;
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for i=1:length(ktab)
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k = ktab(i);
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c = nchoosek(1:l, k);
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m = size(c,1);
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[t, ~] = find(~p.');
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t = reshape(t, [], s);
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c = t(c,:)';
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s = s*m;
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r = repmat((1:s)',[1 k]);
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q = accumarray([r(:) c(:)], i, [s n]);
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p = repmat(p, [m 1]) + q;
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l = l - k;
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end
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end
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end % uperm
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