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# Unique elements in cell array

### Patrick Mineault (view profile)

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

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Description

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)
13 May 2014 I Chieh Chen

### I Chieh Chen (view profile)

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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