From: Berton Gunter <gunter.berton_at_gene.com>

Date: Fri 28 Oct 2005 - 09:11:55 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 Fri Oct 28 09:22:44 2005

Date: Fri 28 Oct 2005 - 09:11:55 EST

Not sure what you're after, but the kth dimension of an array y can be
obtained as:

apply(y,k,c). Each column of the resulting matrix can then be dimensioned,
if you like, via dim(y)[-k] .

- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA

"The business of the statistician is to catalyze the scientific learning process." - George E. P. Box

*> -----Original Message-----
**> From: Mike Meyer [mailto:mikem@salter-point.com]
**> Sent: Thursday, October 27, 2005 3:43 PM
*

> To: Berton Gunter

*> Cc: r-help@stat.math.ethz.ch
**> Subject: Re: [R] How to manipulate an abitrary dimensioned array.
**>
**> Thanks for the suggestion.
**> Perhaps I can see how to use apply to get the ratio, but say
**> I also want
**> to return X[,,,,1] in a general way. Maybe I am being dense
**> but I just
**> don't see it --- probably as a result of too much Perl/Python/Java
**> recently that is clouding my mind.
**>
**> So can someone suggest a general function that will give me the last
**> layer of an arbitrary dimensioned array?
**>
**> Berton Gunter wrote:
**> > Why doesn't apply() already do what you want?
**> >
**> > -- Bert Gunter
**> > Genentech Non-Clinical Statistics
**> > South San Francisco, CA
**> >
**> > "The business of the statistician is to catalyze the
**> scientific learning
**> > process." - George E. P. Box
**> >
**> >
**> >
**> >
**> >>-----Original Message-----
**> >>From: r-help-bounces@stat.math.ethz.ch
**> >>[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Mike Meyer
**> >>Sent: Thursday, October 27, 2005 2:50 PM
**> >>To: r-help@stat.math.ethz.ch
**> >>Subject: [R] How to manipulate an abitrary dimensioned array.
**> >>
**> >>If I have an n1 x n1 x 2 array X I can calculate, say,
**> >>X[,,1]/X[,,2].
**> >>
**> >>If it is a 4 dimensional array then I want to be able to calculate
**> >>X[,,,1]/X[,,,2], and similarly for higher dimensions.
**> >>
**> >>How can I write a function to do this in a general way
**> >>without having to
**> >>do a switch for each possible length(dim(X)). So I want a
**> function g
**> >>that will take an arbitrary dimensioned array, X, and return
**> >>X[,,,1]/X[,,,2], etc. I know how to do this by turning X into a
**> >>vector, then doing the division, then re-shaping as an array,
**> >>but that
**> >>doesn't seem very elegant.
**> >>
**> >>What I think I am missing is how to paste/substitute/eval a
**> bunch of
**> >>commas into an array selection.
**> >>
**> >>Thanks, --Mike
**> >>
**> >>--
**> >>Mike Meyer, Seattle WA
**> >>
**> >>______________________________________________
**> >>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
**> >>
**> >
**> >
**> > ______________________________________________
**> > 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
**>
**> --
**>
**> Mike Meyer, Seattle WA
**>
**>
*

>

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 Fri Oct 28 09:22:44 2005

*
This archive was generated by hypermail 2.1.8
: Fri 28 Oct 2005 - 12:14:25 EST
*