[R] frequence of patterns in a vector

[liujb]

Dear R users,

Suppose I have a vector that consists of characters like ABC, A02, RCA,
etc., and there are about 700 of possible characters. For example,
x <- c("ABC", "ABC", "ABC", "A02", "ABC", "RCA", "ABC", "ABC")

I'd like to get a frequency matrix that looks something like this:
ABC   6
A02   1
RCA   1

I have like 1M numbers of vectors like x (that can have different length
too). How do I do this? 

Thank you very much in advance,

Julia 


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