[R] Construct All Possible Strings from 4 Bases (ATCG)

[Ivar Herfindal]

To add on Robin Hankin's solution, if you want to generate the strings 
you can try:
f <-  function(bases, n){apply(expand.grid(rep(list(bases),n)), 1, 
paste, collapse="")}
f(c("A", "T", "C", "G"), 2)
f(c("A", "T", "C", "G"), 4)

best

Ivar

Robin Hankin wrote:
> 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.
>>   
>
>