[Rd] Segfault with match()
wdunlap at tibco.com
Mon Mar 30 23:07:35 CEST 2015
For consistency with factor+factor and factor+numeric, factor+ordered
should produce a logical vector filled with NAs, not throw an error.
On Mon, Mar 30, 2015 at 1:50 PM, William Dunlap <wdunlap at 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.wickham at gmail.com>
>> This is admittedly a contrived example, but...
>> data(housing, package ="MASS")
>> x <- housing$Type + housing$Sat
>> match(x, unique(x))
>> R-devel at r-project.org mailing list
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