Thanks a lot!

best

On Thu, Nov 1, 2012 at 8:19 AM, D. Rizopoulos <d.rizopoulos@erasmusmc.nl>wrote:

> try this:
>
> l <- list(c(1,2,3,7), c(3,4,5,6,3), c(4,2,5,7), c(2,4,6,3,2), c(3,5,7,2))
>
> sapply(l, head, 4)
>
>
> I hope it helps.
>
> Best,
> Dimitris
>
>
> On 11/1/2012 9:11 AM, Al Ehan wrote:
> > Hi,
> >
> > I have this lame question. I want to convert a list (each with varies in
> > length) to matrix with same row length by eliminating vectors outside the
> > needed range.
> > For example:
> >
> > l<-list(NULL)
> > l[[1]]=1,2,3.7
> > l[[2]]=3,4,5,6,3
> > l[[3]]=4,2,5,7
> > l[[4]]=2,4,6,3,2
> > l[[5]]=3,5,7,2
> >
> >
> > #so say I want to only have 4 rows and 5 column in my matrix (or
> > data.frame) and eliminating the 5th index value in l[[2]] and l[[4]]
> > #what is the simplest code would be? I actually have hundreds of the list
> > components.
> >
> > thanks
> >
> >       [[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.
> >
>
> --
> Dimitris Rizopoulos
> Assistant Professor
> Department of Biostatistics
> Erasmus University Medical Center
>
> Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
> Tel: +31/(0)10/7043478
> Fax: +31/(0)10/7043014
> Web: http://www.erasmusmc.nl/biostatistiek/

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