Learning R: Writing Functions & More

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Does anyone know how to use the R language to write functions and etc?
 
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Yeah I kinda did..and not to clear about it.
 
R programmation

Does anyone know how to use the R language to write functions for string?

I have this type of string:

ATGTTGCGTGTC

I want to evalute the number of A or T and G and C for every A/T a want to sum 2 for the other 4 I want to have one number...
did you have any suggestion? because with If else I have difficultis
Thanks for any help
 

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