Hello, You have access to the C code of the function in the *source* of the package. You can modify it and recompile the package and function (its better then to give a different name!). Best,
Philippe Grosjean ..............................................<°}))><........ ) ) ) ) ) ( ( ( ( ( Prof. Philippe Grosjean ) ) ) ) ) ( ( ( ( ( Numerical Ecology of Aquatic Systems ) ) ) ) ) Mons-Hainaut University, Pentagone (3D08) ( ( ( ( ( Academie Universitaire Wallonie-Bruxelles ) ) ) ) ) 8, av du Champ de Mars, 7000 Mons, Belgium ( ( ( ( ( ) ) ) ) ) phone: + 32.65.37.34.97, fax: + 32.65.37.30.54 ( ( ( ( ( email: [EMAIL PROTECTED] ) ) ) ) ) ( ( ( ( ( web: http://www.umh.ac.be/~econum ) ) ) ) ) http://www.sciviews.org ( ( ( ( ( .............................................................. zhihua li wrote: > Hi netters, > > I want to learn a decision tree from a series of instances (learning > data). The packages > tree or rpart can do this quite well, but the scoring functions > (splitting criteria) are > fixed in these packages, like gini or something. However, I'm going to > use another scoring > function. > At first I wanna modify the R code of tree or rpart and put my own > scoring function in. But it seems that tree and rpart perform the > splitting procedure by calling external C functions, which I have no > access to. So do I have to write R code from scratch to build the tree > with my own scoring functions? It's a really tough task. Or r there > other R packages that can do similar things with more flexible and > extensible code? > > Thanks a lot! > > > ------------------------------------------------------------------------ > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html