[R] sort a data frame according to roman characters

[Gabor Csardi]

I assume that data$Roman is character.

data[order(as.numeric(as.roman(data$Roman))),] should do it. Maybe
data[order(as.roman(data$Roman)), ] is enough too.

Gabor

On Tue, Feb 12, 2008 at 10:36:50AM +0000, 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?
> 
> Thanks in advance.
> 
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-- 
Csardi Gabor <csardi at rmki.kfki.hu>    UNIL DGM