Bingo! Thx Gabor.

Thank you too Tal, I looked briefly at the package and it looks like a nice
interface. I keep it in mind for later.

Cheers
Joris

On Fri, May 28, 2010 at 2:25 PM, Gabor Grothendieck <ggrothendieck@gmail.com
> wrote:

> Try this:
>
> as.numeric(gsub("\\D", "", X))
>
> On Fri, May 28, 2010 at 8:21 AM, Joris Meys <jorismeys@gmail.com> wrote:
> > Dear all,
> >
> > I have a vector of filenames which begins like this :
> > X <- c("OrthoP1_DNA_str.aln", "OrthoP10_DNA_str.aln",
> > "OrthoP100_DNA_str.aln",
> > "OrthoP101_DNA_str.aln", "OrthoP102_DNA_str.aln",
> "OrthoP103_DNA_str.aln",
> > "OrthoP104_DNA_str.aln", "OrthoP105_DNA_str.aln",
> "OrthoP106_DNA_str.aln",
> > "OrthoP107_DNA_str.aln")
> >
> > using
> > grep("(\\d+)",X,perl=T,value=T)
> >
> > I get the complete values back. Yet, I want a vector :
> >
> > c(1,10,100,101,102,103,104,105,106,107)
> >
> > In Perl, using the brackets allows for extracting only the numbers (using
> a
> > construct with $1 for those who know Perl).
> >
> > I want to do the same in R, but can't find a way of doing that without
> > extensive string manipulations. Problem is that the length of the numbers
> > differ, so I can't use substr.
> > I tried
> >> strsplit(X,"\\d+")
> > [[1]]
> > [1] "OrthoP"       "_DNA_str.aln"
> > which gives me exactly what I want to throw away. So :
> >> strsplit(X,"\\D+")
> > [[1]]
> > [1] ""  "1"
> >
> > [[2]]
> > [1] ""   "10"
> > gives something I can use, but it still requires a lot of list
> manipulation
> > afterwards to get the right vector. Is there an option or a function I'm
> > missing somewhere?
> >
> > Cheers
> > Joris
> >
> > --
> > Joris Meys
> > Statistical Consultant
> >
> > Ghent University
> > Faculty of Bioscience Engineering
> > Department of Applied mathematics, biometrics and process control
> >
> > Coupure Links 653
> > B-9000 Gent
> >
> > tel : +32 9 264 59 87
> > Joris.Meys@Ugent.be
> > -------------------------------
> > Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
> >
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> >
> > ______________________________________________
> > 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.
> >
>



-- 
Joris Meys
Statistical Consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

Coupure Links 653
B-9000 Gent

tel : +32 9 264 59 87
Joris.Meys@Ugent.be
-------------------------------
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php

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