Message-ID: <Pine.OSF.4.33.0208281214570.279949-100000@pobox.upenn.edu>
Date: 2002-08-28T16:28:28Z
From: Yuelin Li
Subject: all possible subsets of r out of n
Has anyone written a function that returns all possible
subsets of r elements out of a vector that contains n
elements? I have not been able to find an answer in the FAQ
or the archives.
Say I have a vector: letters[1:10]. I want to get a matrix
of 120 rows that contains all possible subsets of 3 letters
out of the 10. And I would like to be able to generalize to
any r out of n, like function(x=letters[1:10], r=3) that
returns:
a, b, c
a, b, d
a, b, e
...
etc.
Many thanks in advance,
- Yuelin Li.
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