[R] keeping original order in factor()

Peter Alspach PAlspach at hortresearch.co.nz
Wed Jun 18 06:32:50 CEST 2008


levels(factor(foo, levels=c('b','a')))

should work.  You can make foo an ordered factor too, but that is not

HTH .......

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Andrew Yee
> Sent: Wednesday, 18 June 2008 4:22 p.m.
> To: r-help at r-project.org
> Subject: [R] keeping original order in factor()
> Apologies for the naieveness of this question, but I'm having 
> trouble figuring out to have factor() maintain original ordering.
> For example,
> foo <- c("b","b","a","a")
> levels(factor(foo, ordered=T)) #I'd like this to return as "b" "a"
>                                           #not "a" "b"
> I thought having ordered=T would do the trick.
> Thanks,
> Andrew
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