From: "Todd A. Jacobs" <tjacobs-sndr-019fdb@...>
Date: 2010-06-04T01:04:48+09:00
Subject: Permutations that include sub-arrays in ruby?

Ruby has a terrific implementation of single-valued permutations, but it
doesn't yield the results I expected when using arrays of arrays. For
example:

    [[1, 2], [2, 3]].permutation.to_a.include? [2, 1]
    => false

The reason is that there's no permutation of the sub-arrays, just of the
top-level array elements. Am I overlooking something obvious here? I'd
like the permutations to include randomization within each sub-array,
too.

-- 
"Oh, look: rocks!"
	-- Doctor Who, "Destiny of the Daleks"