Use reverseComplement() in the Biostrings package.
B.
On Mar 8, 2015, at 10:08 PM, saran wai <darwinm13s...@hotmail.com> wrote:
> Hi I'm new to R programming and trying to write program for Reverse and
> Complementary Base. the objective is to Design A DNA primer. So I have a DNA
> sequence with base A T C G and A complement to T; T=A;C=G;G=C. I just figure
> out How to Reverse It Already. but for the Complement i can only make it
> answer for just 1 base but cant be all of the sequence. and i dont know how
> to combine reverse and complement function. here is my code and im totallt
> confuse with it. Cn someone help me with this problem? You will be my life
> savior! thank you! strReverse <- function(x) sapply(lapply(strsplit(x,
> NULL), rev), paste, collapse="") strReverse(c("ATCGGTCAATCGA"))
> complement.base = function(base){ if(base == 'A' | base == 'a')
> print("T") if(base == 'T' | base == 't') print("A") if(base == 'G' | base
> == 'g') print("C") if(base == 'C' | base == 'c') print("G")}
> complement.base(base="A")
> [[alternative HTML version deleted]]
>
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