Trying to return a specified number of characters from a gene sequence in R

Question

I have a DNA sequence like: cgtcgctgtttgtcaaagtcg....

that is possibly 1000+ letters long.

However, I only want to look at letters 5 to 200, f

Answer 1

See also the Bioconductor package Biostrings that is a good choice if you need to handle large biological sequences or set of sequences.

#source("http://bioconductor.org/biocLite.R");biocLite("Biostrings") 
library(Biostrings)
s <-paste(rep("gtcgctgtttgtcaac",20),collapse="")
d <- DNAString(s)
d[5:200]
as.character(d[5:200])