it also works with vectors, e.g.
x <- c("Ca00Mn48_0.gout", "Ca01Mn47_0.gout", "Ca01Mn47_1.gout",
"Ca48Mn00_0.gout")
substr(x, 3, 4)
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
----- Original Message -----
From: "Roger Mason" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, September 19, 2007 3:03 PM
Subject: [R] apply
> Hello,
>
> I have a list of filenames extracted from a data-frame thus:
>
> files <- main$file
>
> e.g. file[[1]] returns
>
> [1] Ca00Mn48_0.gout
> 4702 Levels: Ca00Mn48_0.gout Ca01Mn47_0.gout Ca01Mn47_1.gout
> ... Ca48Mn00_0.gout
>
> I want to extract the substring that contains the two digits after
> "Ca". This works on individual entries, e.g. substr(files[[1]],3,4)
> returns "00".
>
> I wish to apply substr() to all the entries in files. All my
> efforts
> fail. Could some kind soul explain how to do what I want?
>
> Thanks,
>
> Roger Mason
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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