Hi
you could try
do.call('rbind',aa)
then turn the matrix into data frame
regards
Tengfei
On Wed, Apr 28, 2010 at 10:56 PM, Yuan Jian <jayuan2...@yahoo.com> wrote:
> Hello,
>
> I have a data.frame:
> name col1 col2 col3 col4
> AA 23 54 0.999 0.78
> BB 123 5 1 0.99
> AA 203 98 0.79 0.99
>
> I want to get mean value data.frame in terms of name:
>
> name col1 col2 col3 col4
>
> AA 113.0000 76.0000 0.8945 0.8850
>
> BB 123.00 5.00 1.00 0.99
>
> I tried to use by function:
>
> >aa<-by(test[,2:5], feature, mean)
> I found aa is "by" function.
> > class(aa)
> [1] "by"
>
> how can I transfer aa to a data frame?
>
> thanks
> YU
>
>
>
>
>
>
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@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.
>
>
--
Tengfei Yin
MCDB PhD student
1620 Howe Hall, 2274,
Iowa State University
Ames, IA,50011-2274
Homepage: www.tengfei.name
[[alternative HTML version deleted]]
______________________________________________
R-help@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.
