[R] renaming factors *efficiently*

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Tue Apr 13 16:43:59 CEST 2010


for(i in colnames(dummy)){
	levels(dummy[, i]) <- abbreviate(levels(dummy[, i]))
}

HTH,

Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium

tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey
  

> -----Oorspronkelijk bericht-----
> Van: r-help-bounces op r-project.org 
> [mailto:r-help-bounces op r-project.org] Namens Federico Calboli
> Verzonden: dinsdag 13 april 2010 16:18
> Aan: r-help
> Onderwerp: [R] renaming factors *efficiently*
> 
> Hi All,
> 
> I have a data frame where a couple of columns are factors, 
> with long and complex names. Everything works ok --in R, but 
> I need to export the data so it can be used on a dumber 
> program (one with a three letters name starting with S...). I 
> know that those complex factor names are causing problems 
> reading the data in from acsv file, so I was thinking of 
> renaming the factors. Problem is, I have 173 and 690 factors 
> respectively, so I'd appreciate any advice on how to do it 
> *efficiently*
> 
> TIA,
> 
> Federico
> 
> 
> --
> Federico C. F. Calboli
> Department of Epidemiology and Biostatistics Imperial 
> College, St. Mary's Campus Norfolk Place, London W2 1PG
> 
> Tel +44 (0)20 75941602   Fax +44 (0)20 75943193
> 
> f.calboli [.a.t] imperial.ac.uk
> f.calboli [.a.t] gmail.com
> 
> ______________________________________________
> R-help op 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.
> 

Druk dit bericht a.u.b. niet onnodig af.
Please do not print this message unnecessarily.

Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer 
en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is
door een geldig ondertekend document. The views expressed in  this message 
and any annex are purely those of the writer and may not be regarded as stating 
an official position of INBO, as long as the message is not confirmed by a duly 
signed document.



More information about the R-help mailing list