49 lines
1.6 KiB
Matlab
49 lines
1.6 KiB
Matlab
function p = uperm(a)
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% Return all unique permutations of possibly-repeating array elements
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% =========================================================================
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% Copyright © 2014 Bruno Luong <brunoluong@yahoo.com>
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% Copyright © 2020 Dynare Team
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%
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% This file is part of Dynare.
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%
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% Dynare is free software: you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation, either version 3 of the License, or
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% (at your option) any later version.
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%
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% Dynare is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <https://www.gnu.org/licenses/>.
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% =========================================================================
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% Original author: Bruno Luong <brunoluong@yahoo.com>, April 20, 2014
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% https://groups.google.com/d/msg/comp.soft-sys.matlab/yQKVPTYrv6Q/gw1MzNd9sYkJ
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% https://stackoverflow.com/a/42810388
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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 = histc(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 |