Message-ID: <4948C170.3000405@cam.ac.uk>
Date: 2008-12-17T09:08:00Z
From: robin hankin
Subject: Construct All Possible Strings from 4 Bases (ATCG)
In-Reply-To: <73f827b50812170100i5da8f92bvb75c86808614e038@mail.gmail.com>
Gundala
f <- function(n){expand.grid(rep(list(seq_len(4)),n))}
HTH
Robin
Gundala Viswanath wrote:
> Dear all,
>
> Is there an efficient way in R to construct all strings from 4 bases (ATCG).
> If we want a length L string, there are 4 ^ L possible strings of such.
>
> e . g with L = 2 we have AA, AT, AC, AG, .. GC, GA, GT, GG as many as
> 4 ^ 2 = 16 strings,
> with L = 3 we have as many as 4 ^ 3 = 64 strings
>
>
> - Gundala Viswanath
> Jakarta - Indonesia
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
--
Robin K. S. Hankin
Uncertainty Analyst
University of Cambridge
19 Silver Street
Cambridge CB3 9EP
01223-764877