[R] permutations of a binary matrix with fixed margins

From: Mathieu Jérôme <jerome.mathieu_at_snv.jussieu.fr>
Date: Thu 05 Apr 2007 - 13:34:01 GMT


Dear R Users,
How can I randomize a matrix (with contains only 0 and 1) with the constraint that margin totals (columns and rows sums) are kept constant? Some have called this "swap permutation" or something like that.

The principle is to find bloc of
10
01
and change it for
01
10
there can be several rows or columns between these numbers. It probably exists in R, but I can't find the function. I am aware of permcont, but it works only for 2x2 matrices

thanks in advance
Jerome

-- 
Jérôme Mathieu
Laboratory of soil tropical ecology
UPMC
jerome.mathieu@snv.jussieu.fr

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Received on Thu Apr 05 23:46:10 2007

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