correlationsMultiClass.C
#include "tmvaglob.C"
// this macro plots the correlation matrix of the various input
// variables used in TMVA (e.g. running TMVAnalysis.C). Signal and
// Background are plotted separately
// input: - Input file (result from TMVA),
// - use of colors or grey scale
// - use of TMVA plotting TStyle
void correlationsMultiClass( TString fin = "TMVA.root", Bool_t isRegression = kFALSE,
Bool_t greyScale = kFALSE, Bool_t useTMVAStyle = kTRUE )
{
// set style and remove existing canvas'
TMVAGlob::Initialize( useTMVAStyle );
// checks if file with name "fin" is already open, and if not opens one
TFile* file = TMVAGlob::OpenFile( fin );
TDirectory* vardir = (TDirectory*)gDirectory->Get( "InputVariables_Id" );
std::vector<TString> classnames(TMVAGlob::GetClassNames(vardir));
// signal and background or regression problem
Int_t ncls = classnames.end() - classnames.begin();
std::vector<TString> hnames(classnames);
const Int_t width = 600;
for (Int_t ic=0; ic<ncls; ic++) {
hnames[ic] = TString("CorrelationMatrix")+ hnames[ic];
TH2* h2 = file->Get( hnames[ic] );
cout << "Looking for histo " << hnames[ic] << " in " << fin << endl;
if(!h2) {
cout << "Did not find histogram " << hnames[ic] << " in " << fin << endl;
continue;
}
TCanvas* c = new TCanvas( hnames[ic],
Form("Correlations between MVA input variables (%s)",
classnames[ic].Data()),
ic*(width+5)+200, 0, width, width );
Float_t newMargin1 = 0.13;
Float_t newMargin2 = 0.15;
if (TMVAGlob::UsePaperStyle) newMargin2 = 0.13;
c->SetGrid();
c->SetTicks();
c->SetLeftMargin ( newMargin2 );
c->SetBottomMargin( newMargin2 );
c->SetRightMargin ( newMargin1 );
c->SetTopMargin ( newMargin1 );
gStyle->SetPalette( 1, 0 );
gStyle->SetPaintTextFormat( "3g" );
h2->SetMarkerSize( 1.5 );
h2->SetMarkerColor( 0 );
Float_t labelSize = 0.040;
h2->GetXaxis()->SetLabelSize( labelSize );
h2->GetYaxis()->SetLabelSize( labelSize );
h2->LabelsOption( "d" );
h2->SetLabelOffset( 0.011 );// label offset on x axis
h2->Draw("colz"); // color pads
c->Update();
// modify properties of paletteAxis
TPaletteAxis* paletteAxis = (TPaletteAxis*)h2->GetListOfFunctions()->FindObject( "palette" );
paletteAxis->SetLabelSize( 0.03 );
paletteAxis->SetX1NDC( paletteAxis->GetX1NDC() + 0.02 );
h2->Draw("textsame"); // add text
// add comment
TText* t = new TText( 0.53, 0.88, "Linear correlation coefficients in %" );
t->SetNDC();
t->SetTextSize( 0.026 );
t->AppendPad();
// TMVAGlob::plot_logo( );
c->Update();
TString fname = "plots/";
fname += hnames[ic];
TMVAGlob::imgconv( c, fname );
}
}