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Easy way to split a matrix according to column value


From: alewar
Subject: Easy way to split a matrix according to column value
Date: Wed, 2 Feb 2011 06:49:44 -0800 (PST)

Hello,

perhaps someone can help me with this. 
Suppose I have the following matrix:

m = 
0  0  1
0  1  0
0  1  1
1  0  0
1  1  0
1  1  1

and I want to split it depending on the values of a column. 
For example, give me the submatrix for which the second column is 1

0  1  0
0  1  1
1  1  0
1  1  1

or for which the 3rd column is 0

0  1  0
1  0  0
1  1  0

etc.

Is there an easy way to do this without a for-loop?

Many thanks!

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