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Dear List, I’d like to modify the R rpart package source code to add a new split criterion. I’m familiar with R, but not at all with C or C++. I understand C and C++ are quite different, and I don’t have the time to learn both, so my questions are (i) which one should I learn for the specific task mentioned above? (I understand rpart routines are written in C, but want to check this), (ii) more