[R] Aggregate?

[Gustaf Rydevik]

Hi All,

I think i'm failing to undersatnd how aggregate() is supposed to work.

example:

 test1<-sample(c(0,1),100,replace=T)
test2<-sample(letters,100,replace=T)
aggregate(test1,list(test2),sum)
Error in data.frame(w, lapply(y, unlist, use.names = FALSE)) :
        arguments imply differing number of rows: 26, 0

I thought this would give me a list containing the number of ones that
"belong" to each letter. What am I doing wrong?

Thanks in advance,

Gustaf

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