4.33333

4.3 | 3 ratings Rate this file 24 Downloads (last 30 days) File Size: 1.4 KB File ID: #31718

Unique elements in cell array

by

 

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

| Watch this File

File Information
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)
Tags for This File   Please login to tag files.
Please login to add a comment or rating.
Comments and Ratings (4)
13 May 2014 I Chieh Chen

Really nice, thanks a lot~

05 Nov 2013 Kevin Bartlett  
14 Sep 2012 Andrey

Good, but limited usage only to numeric matrixes.

15 Feb 2012 Jessica Lam

Really Useful.
Thanks so much=)

Contact us