Try this:

aggregate(hobby ~ id + name, a, FUN = toString)


On Thu, Oct 7, 2010 at 12:52 PM, Tan, Richard <r...@panagora.com> wrote:

> Hi, R function aggregate can only take summary stats functions, can I
> aggregate text columns?  For example, for the dataframe below,
>
>
>
> > a <- rbind(data.frame(id=1, name='Tom',
> hobby='fishing'),data.frame(id=1, name='Tom',
> hobby='reading'),data.frame(id=2, name='Mary',
> hobby='reading'),data.frame(id=3, name='John',
> hobby='boating'),data.frame(id=2, name='Mary', hobby='running'))
>
> > a
>
>  id name   hobby
>
> 1  1  Tom fishing
>
> 2  1  Tom reading
>
> 3  2 Mary reading
>
> 4  3 John boating
>
> 5  2 Mary running
>
>
>
>
>
> I want output as
>
> >b
>
> id name hobbies
>
> 1 Tom    fishing reading
>
> 2 Mary reading running
>
> 3 John boating
>
>
>
>
>
>
>
> Thanks,
>
> Richard
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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> 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-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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