could not find function "as.party.Weka_tree"

Question

I'm struggling with an error message that I don't understand. I'm doing some decision trees and everything goes fine, until I try to plot it

plot(as.party.Weka_tree(CostSensitive_Tree))

which gives this error:

Error in h(simpleError(msg, call)) : 
  error in evaluating the argument 'x' in selecting a method for function 'plot': could not find function "as.party.Weka_tree"

I checked multiple times with help.search("as.party.Weka_tree") and the package ( partykit) is installed, what could be the cause of this error?

Thanks!

Answer 1

First, you need to make sure that the package is loaded, ie, library("partykit") . Second, you should not call the S3 method directly but just say as.party(CostSensitive_Tree) . Internally the as.party() generic function then dispatches to the as.party.Weka_tree() method but the latter should not be called directly.