Hi
r-help-boun...@r-project.org napsal dne 29.04.2010 08:11:41:
> Hi
>
> you could try
>
> do.call('rbind',aa)
No, No, No. rbind and cbind binds vectors as rows or columns of
***matrix***, result is not a data frame
do.call("rbind",aa)
X069rutil X102anatas
105 26.9 7.9
200 22.8 10.6
400 30.6 13.3
600 50.8 20.6
800 78.7 NA
exp.df<-do.call("rbind",aa)
str(exp.df)
num [1:5, 1:2] 26.9 22.8 30.6 50.8 78.7 7.9 10.6 13.3 20.6 NA
- attr(*, "dimnames")=List of 2
..$ : chr [1:5] "105" "200" "400" "600" ...
..$ : chr [1:2] "X069rutil" "X102anatas"
If some object has rectangular shape and has column names it does not
automatically mean that it is data frame
Regards
Petr
>
>
> 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.
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