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CountMember

by Jos

27 May 2005 (Updated 21 Dec 2008)

Code covered by BSD License

Count members.

Editor's Notes:

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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+).

Tags for This File
Everyone's Tags	cell, count, count member, hist, miscellaneous, potw, set, unique, utilities, utility
Tags I've Applied
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Comments and Ratings (5)
31 May 2005	Dimitri Shvorob
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]
08 Feb 2007	Val cucche	:)
05 Dec 2007	Jalal A	many thanks for posting this!
19 Dec 2008	Pete sherer	Excellent. It could be better if you can also return the logical index as a second output.

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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

Tag Activity for this File
Tag	Applied By	Date/Time
count member	Jos	22 Oct 2008 07:49:29
cell	Jos	22 Oct 2008 07:49:29
hist	Jos	22 Oct 2008 07:49:29
utilities	Jos	22 Oct 2008 07:49:29
miscellaneous	Jos	22 Oct 2008 07:49:29
unique	Jos	24 Oct 2008 15:38:05
count	Jos	24 Oct 2008 15:38:05
set	Jos	24 Oct 2008 15:38:05
utility	Jos	24 Oct 2008 15:38:05
potw	Shari Freedman	20 Apr 2009 13:11:05

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