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

Use the substring function:

> tmp.string <- paste(LETTERS, collapse="")
> tmp.string <- substr(tmp.string, 4, 10)
> tmp.string
[1] "DEFGHIJ"