[R] how to quote "factors" in a function?

[casperyc]

### code ###
    x=sample(LETTERS[1:26],100,T)
    prob=function(y){
            count=sum(x==y)
            total=length(x)
            count/total
    }
### end ###

How do I quote the letters A,B,C,D ect, in order to make the "prob" function
return the weights of the desired Letter?

Thanks!

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