I work very mutch with the packages RWeka and multicore. If you try to run J48 or any tree of RWeka with multicore we hava some errors.
Example I: library(RWeka); library(multicore); mclapply(1:100, function(i) { J48(Species ~., iris); }); Output: "Error in .jcall(o, \"Ljava/lang/Class;\", \"getClass\") : \n java.lang.ClassFormatError: Incompatible magic value 1347093252 in class file java/lang/ProcessEnvironment$StringEnvironment\n" Example II: library(multicore); mclapply(1:100, function(i) { RWeka::J48(Species ~., iris); }); Output: Erro em .jcall(x$classifier, "S", "toString") : RcallMethod: attempt to call a method of a NULL object. Do you know some way to work with parallel processing and RWeka? I tried MPI and SNOW without success. R version 3.0.2 (2013-09-25) -- "Frisbee Sailing" Ubuntu 12.04 x64 -- Luís Paulo Faina Garcia Engenheiro de Computação - Universidade de São Paulo São Carlos - SP - Brasil [[alternative HTML version deleted]]
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