From: Liaw, Andy <andy_liaw_at_merck.com>

Date: Tue 27 Jun 2006 - 22:27:34 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jun 27 22:34:46 2006

Date: Tue 27 Jun 2006 - 22:27:34 EST

You might want to try the Oarray package on CRAN.

Andy

From: Matthias Braeunig

*>
*

> Thanks, this is not what what I meant. I need to reshape the

*> original dataframe that I can access p_f[X] for numerical X.
**> Maybe I was not clear enough.
**>
**> The problem really is that X starts at 0. Note that in my
**> example changing the row names to 0:2 does not have the
**> desired effect.
**>
**>
**>
**> jim holtman wrote:
**> > You need to specify the row/column name as character:
**> >
**> >> y
**> > X1 X2 X3 X4
**> > 0 0.1 0.1 0.1 0.1
**> > 1 0.2 0.2 0.2 0.2
**> > 2 0.3 0.3 0.3 0.3
**> >
**> >> y[,'X3']
**> > [1] 0.1 0.2 0.3
**> >> y['0','X3']
**> > [1] 0.1
**> >
**> >
**> >
**> >
**> > On 6/26/06, Matthias Braeunig <mb.atelier@web.de> wrote:
**> >>
**> > Dear R-helpers,
**> >
**> >
**> > my data.frame is of the form
**> >
**> > x <- data.frame( f=gl(4,3), X=rep(0:2,4), p=c(.1,.2,.3)) x
**> > f X p
**> > 1 1 0 0.1
**> > 2 1 1 0.2
**> > 3 1 2 0.3
**> > 4 2 0 0.1
**> > 5 2 1 0.2
**> > 6 2 2 0.3
**> > 7 3 0 0.1
**> > 8 3 1 0.2
**> > 9 3 2 0.3
**> > 10 4 0 0.1
**> > 11 4 1 0.2
**> > 12 4 2 0.3
**> >
**> > which tabulates some values p(X) for several factors f.
**> >
**> > Now I want to put it in "wide" format, so that factor
**> levels appear as
**> > column heads. Note also that X starts from zero. It would
**> be nice if I
**> > could simply access p_f[X==0] as f[0]. How can I possibly do that?
**> >
**> > (The resilting object does not have to be a data.frame. As
**> there are
**> > only numeric values, also a matrix would do.)
**> >
**> > I tried the following
**> >
**> > y<-unstack(x,form=p~f)
**> > row.names(y) <- 0:2
**> > y
**> > X1 X2 X3 X4
**> > 0 0.1 0.1 0.1 0.1
**> > 1 0.2 0.2 0.2 0.2
**> > 2 0.3 0.3 0.3 0.3
**> >
**> > Now, how to access X3[0], say?
**> >
**> > Maybe reshape would be the right tool, but I could not
**> figure it out.
**> >
**> > I appreciate your help. Thanks!
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide!
**> http://www.R-project.org/posting-guide.html
**>
*

>

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jun 27 22:34:46 2006

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