Re: [R] String manipulation

From: John Fox <jfox_at_mcmaster.ca>
Date: Thu 20 Oct 2005 - 23:54:28 EST


Dear Luis,

How about gsub("[0-9]", "", x) ? This assumes that x contains the character data and not a factor, as would usually be the case in a data frame. If the variable is really a factor, then use as.character(x) in the call to gsub().

I hope this helps,
 John



John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Luis Ridao Cruz
> Sent: Thursday, October 20, 2005 8:24 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] String manipulation
>
> R-help,
>
> I have a data frame which contains a character string column
> that is something like;
>
> II11
> II18
> II23
> III1
> III13
> III16
> III19
> III2
> III7
> IV10
> IV11
> IV12
> IX16
> IX4
> V12
> V18
> V2
> V20
> V23
> V4
> VII14
> VII18
> VII21
> VII26
> VII28
> VII33
> VII4
> VII48
> VII5
> ....
> ....
> ....
>
> I want to apply a function (e.g mean) by grouping according
> to the roman part of the string, i.e,
>
> by I
> by V
> by VII
> ...
> ...
> and so on.
>
> I have looked at string manipulation functions (grep,
> pmatch,,,) but I can't really get it the way I want.
> Can anyone help?
>
> Thanks in advance.
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Oct 21 00:08:05 2005

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