[R] list to Matrix - remove NAs von list.

[jim holtman]

Another alternative:

do.call('cbind', l[!sapply(l, function(x)all(is.na(x)))])



On 11/2/07, Petr PIKAL <petr.pikal at precheza.cz> wrote:
> Hi
>
> r-help-bounces at r-project.org napsal dne 02.11.2007 12:00:09:
>
> > Thanks,
> >
> > I have the case that there is a NA in the list. This should not be a
> column.
> > But na.omit(l) does not work for lists. How to remove NAs from a list?
> >
> > l <- list(c(1,2,3),NA,c(1,2,3))
> > mat <- do.call(cbind, l)
>
> If number of NA is not big you can use
>
>  mat[,which(!is.na(colSums(mat)))]
>
> to select non NA columns.
>
> Regards
> Petr
>
> >
> > Best
> > Markus
> >
> >
> > Dimitris Rizopoulos schrieb:
> > > you can use do.call(), e.g.,
> > >
> > > do.call(cbind, l)
> > >
> > >
> > > I hope it helps.
> > >
> > > Best,
> > > Dimitris
> > >
> > >
> > > ----
> > > Dimitris Rizopoulos
> > > Ph.D. Student
> > > Biostatistical Centre
> > > School of Public Health
> > > Catholic University of Leuven
> > >
> > > Address: Kapucijnenvoer 35, Leuven, Belgium
> > > Tel: +32/(0)16/336899
> > > Fax: +32/(0)16/337015
> > > Web: http://med.kuleuven.be/biostat/
> > >      http://www.student.kuleuven.be/~m0390867/dimitris.htm
> > >
> > >
> > > Quoting Markus Schmidberger <schmidb at ibe.med.uni-muenchen.de>:
> > >
> > >> Hello,
> > >>
> > >> I have a list of vectors (all the same length). How to convert the
> list
> > >> to a matrix? Each vector should be a column.
> > >> I tried this:
> > >>
> > >> l <- list(c(1,2,3),c(1,2,3),c(1,2,3))
> > >> mat <- matrix( unlist(l), nrow=length(l) )
> > >>
> > >> But I think this is not very efficient. Is there a better solution?
> > >>
> > >> Thanks
> > >> Markus
> > >>
> > >> --
> > >> Dipl.-Tech. Math. Markus Schmidberger
> > >>
> > >> Ludwig-Maximilians-Universität München
> > >> IBE - Institut für medizinische Informationsverarbeitung,
> > >> Biometrie und Epidemiologie
> > >> Marchioninistr. 15, D-81377 Muenchen
> > >> URL: http://ibe.web.med.uni-muenchen.de
> > >> Mail: Markus.Schmidberger [at] ibe.med.uni-muenchen.de
> > >>
> > >> ______________________________________________
> > >> R-help at 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.
> > >>
> > >>
> > >
> > >
> > >
> > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
> > >
> >
> >
> > --
> > Dipl.-Tech. Math. Markus Schmidberger
> >
> > Ludwig-Maximilians-Universität München
> > IBE - Institut für medizinische Informationsverarbeitung,
> > Biometrie und Epidemiologie
> > Marchioninistr. 15, D-81377 Muenchen
> > URL: http://ibe.web.med.uni-muenchen.de
> > Mail: Markus.Schmidberger [at] ibe.med.uni-muenchen.de
> > Tel: +49 (089) 7095 - 4599
> >
> > ______________________________________________
> > R-help at 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.
>
> ______________________________________________
> R-help at 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.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?