[R] unorder an ordered factor

[David Winsemius]

On Apr 18, 2010, at 7:55 AM, David Winsemius wrote:

>
> On Apr 18, 2010, at 6:03 AM, David.Epstein wrote:
>
>>
>> Given an ordered factor, how does one unorder it?
>> I tried various commands with reorder, with order=F, but they all  
>> gave me
>> error messages. I also tried to drop the order with various 'as dot
>> something' commands, but these didn't work either.
>
> > ord <- ordered(4:1)
> > str(ord)
> Ord.factor w/ 4 levels "1"<"2"<"3"<"4": 4 3 2 1
> > unclass(ord)
> [1] 4 3 2 1
> attr(,"levels")
> [1] "1" "2" "3" "4"
> > factor(unclass(ord))
> [1] 4 3 2 1
> Levels: 1 2 3 4
> > is.ordered(factor(unclass(ord)))
> [1] FALSE
>
> So this appears to be the way --->
>
> > ord <- factor(unclass(ord))
> >
> > str(ord)
> Factor w/ 4 levels "1","2","3","4": 4 3 2 1

the class()<- operation also works:

 > ord <- ordered(4:1)
 > class(ord) <-"factor"
 > ord
[1] 4 3 2 1
Levels: 1 2 3 4
 > is.ordered(ord)
[1] FALSE

>> -- 
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>>
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>
> David Winsemius, MD
> West Hartford, CT
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT