Re: [R] sort a data frame according to roman characters

From: Peter Dalgaard <P.Dalgaard_at_biostat.ku.dk>
Date: Tue, 12 Feb 2008 12:04:37 +0100

Luis Ridao Cruz wrote:
> R-help,
>
> I have a data frame with one column containing roman numbers
> The data are not sorted as : I II III IV V VI VII VIII IX
> X XI XII XIII XIV XV
>
> Using data[order(data$Roman),] does not do the job.
>
> How can this be done?
>
>

Someone went there before you (and me):

library(utils)
data[order(as.roman(data$Roman)),]

(possibly ....as.character(data$Roman).... if it has been read as a factor)

-- 
   O__  ---- Peter Dalgaard             Ă˜ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard_at_biostat.ku.dk)                  FAX: (+45) 35327907

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Received on Tue 12 Feb 2008 - 12:06:45 GMT

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