Construct All Possible Strings from 4 Bases (ATCG)
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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Robin K. S. Hankin Uncertainty Analyst University of Cambridge 19 Silver Street Cambridge CB3 9EP 01223-764877