Multiple INPUT files

TMVA
1

Dear people
I would like to know how to get multiple input files in TMVA. For example
TFile *input(0);
TString fname = “./tmva_class_example.root”;
if (!gSystem->AccessPathName( fname )) {
input = TFile::Open( fname ); // check if file in local directory exists
}
else {
TFile::SetCacheFileDir(".");
input = TFile::Open(“http://root.cern.ch/files/tmva_class_example.root”, “CACHEREAD”);
}
if (!input) {
std::cout << “ERROR: could not open data file” << std::endl;
exit(1);
}
std::cout << "— TMVAClassification : Using input file: " << input->GetName() << std::endl;

// Register the training and test trees

TTree signalTree = (TTree)input->Get(“TreeS”);
TTree background = (TTree)input->Get(“TreeB”);

Here if you see only one input file is taken i.e TMVA class example.root How to get multiple root files as input?

Regards Rithish

2

Hi,
please check out Posting code? Read this first to make your code snippets a bit more readable.

@moneta knows more but I think you can use a TChain to concatenate multiple TTrees and then you can pass a TChain to TMVA.

Cheers,
Enrico

3

Hi,

You can use the TChain, but you can also add an arbitrary number of signal and background trees when using DataLoader::AddSignalTree and DataLoader::AddBackgroundTree

Lorenzo