I left out the warning - it's still there. The output object is
malformed but either +.factor should prevent this or match() should
check.
Hadley
On Mon, Mar 30, 2015 at 3:50 PM, William Dunlap <wdun...@tibco.com> wrote:
> Did you leave out the warning from "+", which should be an error,
> as it produces an illegal ordered factor in this case and factor+factor
> is nonsensical? Or is the warning missing in the current development
> version of R?
>
>> x <- factor("A", ordered=FALSE) + factor(c("B","C"), ordered=TRUE)
> Warning message:
> Incompatible methods ("Ops.factor", "Ops.ordered") for "+"
>> str(x) # 2 levels, so integer codes of 3 is illegal
> ordered[1:2] w/ 2 levels B<C: 2 3
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Mon, Mar 30, 2015 at 1:10 PM, Hadley Wickham <h.wick...@gmail.com> wrote:
>>
>> This is admittedly a contrived example, but...
>>
>> data(housing, package ="MASS")
>> x <- housing$Type + housing$Sat
>> match(x, unique(x))
>>
>> Hadley
>>
>> --
>> http://had.co.nz/
>>
>> ______________________________________________
>> R-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
--
http://had.co.nz/
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