Re: [R] rpart$where and predict.rpart

From: Prof Brian Ripley <>
Date: Tue, 22 Jul 2008 11:51:42 +0100 (BST)

On Tue, 22 Jul 2008, Chua Siang Li wrote:

> Hello there. I have fitted a rpart model.
> > rpartModel <- rpart(y~., data=data.frame(y=y,x=x),method="class", ....)
> and can use rpart$where to find out the terminal nodes that each
> observations belongs.
> Now, I have a set of new data and used predict.rpart which seems to give
> only the predicted value with no information similar to rpart$where.
> May I know how to find out the terminal nodes that each new observations
> belongs to?

You need to read the code to answer questions about internals. A very quick glance at predict.rpart would have told you that

         where <- pred.rpart(object, rpart.matrix(newdata))

is what you are looking for. (Note that pred.rpart like many other internal functions is not exported from the name space.)

> Many thanks.
> ----
> Chua Siang Li
> Consultant - Operations Research
> Acceval Pte Ltd
> Tel: 6297 8740
> Email:
> Website:

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Tue 22 Jul 2008 - 10:58:30 GMT

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