[R] rpart 3.1.0 bug?

[Marc R. Feldesman]

There seems to be a simple, if inelegant, fix for the xpred.rpart problem.

In the file xpred.rpart, I found that changing the following line fixed the 
bug:


costs <- fit$call$costs
     if (is.null(costs))
         costs <- rep(1, nvar)
         parms<-as.double(fit$parms)

Change last line to:
     parms <- as.vector(as.double(unlist(fit$parms)))

This works with all my test examples.  I have no idea how this ramifies to 
other areas of the code that I don't use.  YMMV.


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