[R] rpart 3.1.0 bug?

[Marc R. Feldesman]

I just updated rpart to the latest version (3.1.0).  There are a number of 
changes between this and previous versions, and some of the code I've been 
using with earlier versions (e.g. 3.0.2) no longer work.

Here is a simple illustration of a problem I'm having with xpred.rpart.

iris.test.rpart<-rpart(iris$Species~., data=iris[,1:4], 
parms=list(prior=c(0.5,0.25, 0.25)))
+ )
 > xpred.rpart(iris.test.rpart)
Error in as.double.default(fit$parms) : (list) object cannot be coerced to 
vector type 14
 >
The problem seems to be with the parms parameter in the call to rpart.  If 
I leave parms out of the fit statement, xpred.rpart works fine.

I can't deduce from the help files or the readme what has changed that 
causes this error (I also can't exactly figure out what the error is).  The 
example use of xpred.rpart works fine, but doesn't have a parms argument in 
the rpart function call.

Any help appreciated.


Dr. Marc R. Feldesman
email:  feldesmanm at pdx.edu
email:  feldesman at attglobal.net
fax:    503-725-3905

"Don't know where I'm going.
Don't like where I've been.
There may be no exit.
But hell, I'm going in."  Jimmy Buffett

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