[R] combinatorics

From: Robin Hankin <r.hankin_at_noc.soton.ac.uk>
Date: Fri 13 Oct 2006 - 14:18:56 GMT


Hi

How do I generate all ways of ordering sets of indistinguishable items?

suppose I have two A's, two B's and a C.

Then I want

AABBC
AABCB
AACBC
ABABC
. . .snip...

BBAAC
. . .snip...

CBBAA [there are 5!/(2!*2!) = 30 arrangements. Note AABBC != BBAAC]

How do I do this?

--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

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Received on Sat Oct 14 00:24:37 2006

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