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CountMember

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CountMember

by Jos (10584)

 

27 May 2005 (Updated 21 Dec 2008)

Count members.

Editor's Notes:

This file was selected as MATLAB Central Pick of the Week

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Description

C = COUNTMEMBER(A,B) counts the number of times the elements of array A are present in array B, so that C(k) equals the number of occurences of A(k) in B. A may contain non-unique elements. C will have the same size as A.
A and B should be of the same type, and can be cell array of strings.
 
Examples:
      countmember([1 2 1 3],[1 2 2 2 2])
         -> 1 4 1 0
      countmember({'a','b','c'},{'a','x','a'})
         -> 2 0 0
 
See also ismember, unique, histc

(v1.2, dec 2008)
MATLAB release MATLAB 6.5 (R13)
Other requirements should work on most ML releases (tested for R13+).
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cell, count, count member, hist, miscellaneous, pick of the week, potw, set, unique, utilities, utility
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Comments and Ratings (6)
05 Sep 2011 Abhinav Gaur

just what i needed .. Thanks
19 Dec 2008 Pete sherer

Excellent. It could be better if you can also return the logical index as a second output.
05 Dec 2007 Jalal A

many thanks for posting this!
08 Feb 2007 Val cucche

:)
02 Jun 2005 urs (us) schwarz

ery sleek, jos! just a pedestrian thought: replace your dums with the name of the following var, e.g., [AU,dum,j] with [AU,j,j]
31 May 2005 Dimitri Shvorob  
Updates
18 Aug 2005

Reduced overhead by removing unnecessary dummy variables.
18 Aug 2005

Reduced overhead by removing unnecessary dummy variables.
21 Dec 2008

improved help and comments, fixed some spelling issues

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