%jsroot on
TString dir = gSystem->UnixPathName(__FILE__);
dir.ReplaceAll("stars.C","");
dir.ReplaceAll("/./","/");
TFile *f = new TFile("starsmod.root","RECREATE");
TTree *tree = new TTree("ntuple","data from csv file");
// The file inside has ----> Indice, Temperature (K), Luminosity(L/Lo), Radius(R/Ro), Absolute magnitude(Mv), Star type, Star color, Spectral Class
tree->ReadFile("starsmod.csv","index/I:Temperature/F:Luminosity/F:Radius/F:Absolute_magnitude/F:Star_type/C:Star_color/C:Spectral_Class/C",',');
f->Write();
TFile *_file0 = TFile::Open("starsmod.root");