[R] sort a data frame according to roman characters
Peter Dalgaard
P.Dalgaard at biostat.ku.dk
Tue Feb 12 12:04:37 CET 2008
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)
--
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