search for: mathieu_at_snv

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2007 Oct 02
1
permutations of a binary matrix with fixed margins
...| all(query==1-pattern)) && runif(1)<0.5) x[c(i,ii),c(j,jj)] <- 1 - x[c(i,ii),c(j,jj)] } x } ############################################################### -------------------------------------------------------- From: Mathieu J?r?me <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 principl...