[R] renaming factors *efficiently*

[ONKELINX, Thierry]

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
> 
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> 

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