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

Try

substr("cgtcgctgtttgtcaa[...]", 5, 200)

See substr().