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Highlights from MATCHROW (v1.1, may 2008)

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MATCHROW (v1.1, may 2008)

Jos (10584) (view profile)

04 Apr 2007 (Updated )

Match elements in the rows of a matrix

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Description

MATCHROW - match elements in the rows of a matrix

TF = MATCHROW(M,S) returns a column vector containing a logical 1 (true)where the rows of M contain (in any order) all the elements of S and 0 (false) otherwise. M and S can be a cell array of strings.
If a element occurs N times in S, than it has to be present at least N times in these rows of M as well.

Examples:
M = [ 1 2 3 4 5 ; 1 2 2 4 3; 1 3 4 4 3 ; 3 2 4 2 5 ; 1 4 3 2 4 ] ;
Q = matchrow(M,[1 2 4]) % -> [1 ; 1 ; 0 ; 0 ; 1] ;
M(Q,:) % -> 1 2 3 4 5
% 1 2 2 4 3
% 1 4 3 2 4

Q = matchrow(M,[1 2 4 4])
M(Q,:) % -> 1 4 3 2 4

Q = matchrow({'a','X','c','Y'; 'a','X','Y','d' ;
'b','X','d','e'},{'X','Y'}) % -> [1 ; 1 ; 0] ;

A = rand(999,999) ;
x = 27 ;
tic
find(matchrow(A,A(x,:))) == x % -> true!
toc

MATCHROW is vectorized and pretty quick ...

version 1.1, may 2008

MATLAB release MATLAB 6.5 (R13)
13 Oct 2013 Liber Eleutherios

Liber Eleutherios (view profile)

04 Sep 2009 Mauricio Romero

Mauricio Romero (view profile)

04 Apr 2007 John D'Errico

Good, readable help. Error checks. Good examples, and an H1 line. Nicely vectorized. Its got a "see also" line, the author's name, date written, etc. There are many internal comments, a proper use of warning, and no mlint flags.

This is an example of a code other authors should emulate.

04 Apr 2007 C. S.

Useful, thanks.