•  root_5_28 and TMVA_4_1_2 : 

1. do not forget to source setup.sh in /test directory
2. before running TMVA, always source. Apparently a macro used to plots the efficiencies (mvaEff.C) is not found then TMVAgui.C crashes: 

  dlopen error: dlopen(/Users/bouchet/Desktop/TMVA_4_1_2/TMVA-v4.1.2/test/./mvaeffs_C.so, 9): Library not loaded: lib/libTMVA.dylib

  Referenced from: /Users/bouchet/Desktop/TMVA_4_1_2/TMVA-v4.1.2/test/./mvaeffs_C.so

  Reason: image not found

  Load Error: Failed to load Dynamic link library /Users/bouchet/Desktop/TMVA_4_1_2/TMVA-v4.1.2/test/./mvaeffs_C.so

• gdb with root  and TMVA

> gdb root.exe

>run TMVAClassificationApplication.C\(\"Cuts,CutsD,CutsPCA,Likelihood,LikelihoodD,LikelihoodPCA,LD,Fisher,FisherG,BoostedFisher\"\)

•  user classifier

When using a modified classifier [i.e with modified parameter], for training (in TMVAClassification.C)

 if (Use["myBDT4"])  // Adaptive Boost

     factory->BookMethod( TMVA::Types::kBDT, "BDTcombo",
     "!H:!V:NTrees=2000:nEventsMin=150:MaxDepth=7:BoostType=AdaBoost:AdaBoostBeta=0.5:SeparationType=GiniIndex:nCuts=20:PruneMethod=CostComplexity:PruneStrength=-1" );

 to run the training :  

dh14:test bouchet$ root -l TMVAClassification.C\(\"Likelihood,Fisher,BDT,MLP,myBDT4\"\)

For reading the classifier, be careful with the name (in TMVAClassificationApplication.C) :

add the line :

Use["BDTcombo"]         = 1; // uses Adaptive Boost

to run the macro :

dh14:test bouchet$ root -l TMVAClassificationApplication.C\(\"Likelihood,Fisher,BDT,MLP,BDTcombo\"\)

•  summary of classiffiers performances : here