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

2008-02-12 Thread Peter Dalgaard
Luis Ridao Cruz wrote: > R-help, > > I have a data frame with one column containing roman numbers > The data are not sorted as : III III IV VVI VII VIII IX > XXI XII XIII XIV XV > > Using data[order(data$Roman),] does not do the job. > > How can this be done? > > Someo

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

2008-02-12 Thread Jim Lemon
Luis Ridao Cruz wrote: > R-help, > > I have a data frame with one column containing roman numbers > The data are not sorted as : III III IV VVI VII VIII IX > XXI XII XIII XIV XV > > Using data[order(data$Roman),] does not do the job. > > How can this be done? > order(a

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

2008-02-12 Thread 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 +, Luis Ridao Cruz wrote: > R-help, > > I have a data frame with one column containing roman

[R] sort a data frame according to roman characters

2008-02-12 Thread Luis Ridao Cruz
R-help, I have a data frame with one column containing roman numbers The data are not sorted as : III III IV VVI VII VIII IX XXI XII XIII XIV XV Using data[order(data$Roman),] does not do the job. How can this be done? Thanks in advance. __