Segfault with match()
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 <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> 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/
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