Aggregate?

It does that for me without errors ...
(R 2.3.1 on Mac OSX 10.4.8)
Best, Ingmar
From: Gustaf Rydevik <gustaf.rydevik at gmail.com>
Date: Fri, 8 Dec 2006 12:58:01 +0300
To: <r-help at stat.math.ethz.ch>
Subject: [R] Aggregate?

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

-- 
email:gustaf.rydevik at gmail.com
tel: +46(0)703051451
address: Kantorsgatan 50:190 75424 Uppsala Sweden

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Aggregate?

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