[R] list to Matrix

[Dimitris Rizopoulos]

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
>
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