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Unique elements in cell array

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Unique elements in cell array



unique for numeric cell arrays. If c = {[0],[1,2],[0],[8],[1,2]} returns {[0],[1,2],[8]}

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function [Au, idx, idx2] = uniquecell(A)

Same as built-in unique, but works for cell arrays where each element is a numeric array.

For A a cell array of matrices (or vectors), returns Au, which contains the unique matrices in A, idx, which contains the indices of the last appearance of each such unique matrix, and idx2, which contains th indices such that Au(idx2) == A
Example usage:
A = {[1,2,3],[0],[2,3,4],[2,3,1],[1,2,3],[0]};
[Au,idx,idx2] = uniquecell(A);
Results in:

idx = [6,5,4,3]
Au = {[0],[1,2,3],[2,3,1],[2,3,4]}
idx2 = [2,1,4,3,2,1]
Algorithm: uses cellfun to translate numeric matrices into strings then calls unique on cell array of strings and reconstructs the initial matrices.

MATLAB release MATLAB 7.7 (R2008b)
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Comments and Ratings (4)
13 May 2014 I Chieh Chen

Really nice, thanks a lot~

05 Nov 2013 Kevin Bartlett

Kevin Bartlett (view profile)

14 Sep 2012 Andrey

Andrey (view profile)

Good, but limited usage only to numeric matrixes.

15 Feb 2012 Jessica Lam

Really Useful.
Thanks so much=)

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