Dear all,
pmin/pmax used to work with ordered factors but fail now since this
summer when those functions have tried to handle more cases.
A simple way to trigger the issue is:
> min(ordered(c(1,5,6)))
[1] 1
Levels: 1 < 5 < 6
> pmin(ordered(c(1,5,6)), ordered(c(1,5,6)))
Error in `mostattributes<-`(`*tmp*`, value = attributes(elts[[1L]])) :
adding class "factor" to an invalid object
A simple fix is to explicitly test for the ordered class and use the
internal method in that case as proposed in the attached patch.
Yours,
Erwan
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