> x <- c("ABC", "ABC", "ABC", "A02", "ABC", "RCA", "ABC", "ABC")
> table(x)
x
A02 ABC RCA
1 6 1
> table(x)[c("ABC", "A02", "RCA")]
x
ABC A02 RCA
6 1 1
On May 29, 2009, at 2:15 PM, liujb wrote:
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
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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