[R] analyze amino acid sequence (composition)of proteins

[ucecgxu at ucl.ac.uk]

Dear R-helpers:

thank your for your attention.

i am a newer to R and i am doing some protein category classification based on
the amino acid sequence.while i have some questions urgently.

1. any packages for analysis amino acid sequence

2. given two sequences "AAA" and "BBB",how can i combine them into "AAABBB"

3. based on "AAABBB",how can i get some statistics of this string such as how
many letters,how many "A"s in the string.


Thank you very much and i am looking forward to hearing from you soon

have a nice day!

Best Regards

Marshall