[R] Aggregate?

[Petr Pikal]

Hi

look to your workspace by ls(). I bet there is some mismatch in 
variables as your example works for me without any error. You 
probably redefined sum function.

>  test1<-sample(c(0,1),100,replace=T)
> test2<-sample(letters,100,replace=T)
> aggregate(test1,list(test2),sum)
   Group.1 x
1        b 1
2        c 3
3        d 1
4        e 4

> sum<-5
> aggregate(test1,list(test2),sum)
Error in FUN(X[[1]], ...) : argument "INDEX" is missing, with no 
default

HTH
Petr





On 8 Dec 2006 at 12:58, Gustaf Rydevik wrote:

Date sent:      	Fri, 8 Dec 2006 12:58:01 +0300
From:           	"Gustaf Rydevik" <gustaf.rydevik at gmail.com>
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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Petr Pikal
petr.pikal at precheza.cz