Message-ID: <5.1.1.5.2.20021125164905.03f1b848@poptop.llnl.gov>
Date: 2002-11-26T00:54:38Z
From: Pauline Gu
Subject: permutation
In-Reply-To: <x2k7j1tchj.fsf@biostat.ku.dk>
Dear R experts,
Is there any function in R that I can calculate the permutation lists? I
would like to know if there is any generic one for finding all the
permutation of n choose k?
For example:
perms <- list(1:2)
perms <- add.ttt(3:4, perms)
should give me
> perms
[[1]]
[1] 3 4 1 2
[[2]]
[1] 3 1 4 2
[[3]]
[1] 3 1 2 4
and perms <- add.ttt(5:6, perms)
should give me:
[[1]]
[1] 5 6 3 4 1 2
[[2]]
[1] 5 3 6 4 1 2
[[3]]
[1] 5 3 4 6 1 2
[[4]]
[1] 5 3 4 1 6 2
[[5]]
[1] 5 3 4 1 2 6
[[6]]
[1] 5 6 3 1 4 2
[[7]]
[1] 5 3 6 1 4 2
[[8]]
[1] 5 3 1 6 4 2
[[9]]
[1] 5 3 1 4 6 2
[[10]]
[1] 5 3 1 4 2 6
[[11]]
[1] 5 6 3 1 2 4
[[12]]
[1] 5 3 6 1 2 4
[[13]]
[1] 5 3 1 6 2 4
[[14]]
[1] 5 3 1 2 6 4
[[15]]
[1] 5 3 1 2 4 6
This example is just for those with k=2. How would I calculate those for
any k?
Thanks in advance for your help.
Pauline
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