Dear List,
I'd like to make a few modifications to the typical CART algorithm, and
I'd rather not code the whole thing from scratch. Specifically I want
to use different in-sample and out-of-sample fit criteria in the split
choosing and cross-validation stages.
I see however that the code for CART in both the rpart and the tree
packages is written in C.
Two questions:
* Where is the C code? It might be possible to get a C-fluent
programmer to help me with this.
* Is there any code for CART that is written entirely in R?
Thanks,
Andrew
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