[R] R packages/code for CART that is written entirely in R (not C)

[Andrew Crane-Droesch]

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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