[R] Problem with predict.rpart

[Ursula Sondhauss]

I am using rpart only once in a while. It has been changed and now I
can't get my programs to work again...

predict.rpart used to return posterior probabilities. Now the help
function says it returns:

"if type="vector": vector of predicted responses or, if the response is
a factor, matrix of predicted class probabilities"

Now I hoped

"z <- rpart(as.factor(V1) ~
.,train,method="class",parms=list(prior=apriori,split='information'))
new <- predict.rpart(z,test,type="vector")"

would do the job, but it doesn't. I get predicted responses only.

Trying

"new <- predict.rpart(z,test,type="tree")"

just to see whether I can use tells me

"Error in predict.rpart(z, test, type = "tree") :
        Invalid prediction for rpart objects"

What can I do?

Ursula Sondhauss



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