[R] CART and the `tree' contrib package

[Faheem Mitha]

Dear R people,

I was recently reading the book `Classification and Regression Trees' by
Breiman. This book talks about the CART program. Both Splus and R have
implementations of this. However, the book talks about the possibility of
extending the existing `standard' set of questions (for continuous
variables, these are of the form X < c where X is the variable, c some
const) to questions of the form (for continuous variables) 
sum over i a_i X_i < c where X_i are the cont. variables, a_i and c
consts.

However, this extended set is not implemented in either the R `tree'
package nor the Splus one, to the best of my knowledge. (I believe there
is some original CART package, but I don't know about that). Anyway, I was
wondering why not. Does anyone know?

                                     Sincerely, Faheem Mitha.

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