R help - Mar 2010 - aggregate without removing empty subset

Hi the list,

As it is say in its doc, the aggregate function remove empty subsets. Is 
it possible to NOT remove empty subset ?
--- 8< -------
m <- matrix(1:12,4)
part <-
factor(c("A","B","A","B"),levels=c("A","B","C"))
aggregate(m,list(part),mean)

### I get:
#   Group.1 V1 V2 V3
# 1       A  2  6 10
# 2       B  3  7 11
#
### I would like:
#   Group.1 V1 V2 V3
# 1       A  2  6 10
# 2       B  3  7 11
# 3       C NA NA NA
--- 8< ------


Thanks
Christophe

Try this:

apply(m, 2, tapply, part, mean)

On Mon, Mar 15, 2010 at 2:10 PM, Christophe Genolini
<cgenolin at u-paris10.fr> wrote:
> Hi the list,
>
> As it is say in its doc, the aggregate function remove empty subsets. Is it
> possible to NOT remove empty subset ?
> --- 8< -------
> m <- matrix(1:12,4)
> part <-
factor(c("A","B","A","B"),levels=c("A","B","C"))
> aggregate(m,list(part),mean)
>
> ### I get:
> # ? Group.1 V1 V2 V3
> # 1 ? ? ? A ?2 ?6 10
> # 2 ? ? ? B ?3 ?7 11
> #
> ### I would like:
> # ? Group.1 V1 V2 V3
> # 1 ? ? ? A ?2 ?6 10
> # 2 ? ? ? B ?3 ?7 11
> # 3 ? ? ? C NA NA NA
> --- 8< ------
>
>
> Thanks
> Christophe
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

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