[R] partition.tree() version for rpart ?
Martin Maechler
maechler at stat.math.ethz.ch
Fri Aug 15 12:22:28 CEST 2003
The "tree" package has a nice function partition.tree() for
drawing the (1D or) 2D partition in the case of only (one or)
two predictors {See the examples in help(partition.tree)}.
{and so does S-plus (not in a separate package though)}.
It seems to me that there's no function with similar functionality
available for rpart. Am I mistaken? Has anyone worked on this?
One possible approach might be to provide an as.tree() function
for "rpart" objects and then use partition.tree() from the
"tree" package.
Given that "rpart" is a recommended R package, I'd rather prefer
to have a `standalone' function working with "rpart" objects.
BTW: an optimal name for that function is not clear:
partition.tree could be used, since it's a simple function,
not a "tree" method for a "partition" generic.
parition.rpart() could be used as well.
But for me, a generic partition() function shouldn't be used to
draw (1- or) 2-partitions. If generic/method, I'd prefer
a naming scheme something like plotPart[.(rpart|tree)].
Feedback very welcome.
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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