Change Default Style of TMVA Plotting

ruimig · August 14, 2023, 4:08pm

Greetings ROOT Developers,

I’m currently facing a challenge while trying to customize the appearance of TMVA’s plotted graphs. My environment consists of ‘’'ROOT version 6.26.00 on macOS 12.1. Specifically, I’m aiming to modify the way TMVA generates its plots by default (the gStyle).

However, I’m encountering difficulties. When I navigate to Edit->Style within the TMVA GUI and attempt to change the style, all variables end up being plotted in the same color. Additionally, every time I run the TMVA GUI, the plots revert to a default style as defined in a .h file in the source directory.

I would greatly appreciate any guidance on how to achieve the desired customization. I have a .root file that I load using the command TMVA::TMVAGui("TMVA_Combinatorial.root"); in the ROOT prompt.

Please bear in mind that I’m quite new to the ROOT environment, so any assistance or suggestions would be immensely valuable.

Thank you in advance for your support.

Best regards,
Rui

jalopezg · August 15, 2023, 10:08am

Hi @ruimig; maybe @moneta can help here.

Cheers,
J.

moneta · August 23, 2023, 12:26pm

Hi,
The TMVA style used in the GUI is defined in this file,

github.com

root-project/root/blob/master/tmva/tmvagui/src/tmvaglob.cxx

#include "TMVA/tmvaglob.h"
#include "TMVA/Config.h"

using std::cout;
using std::endl;

// set the style
void TMVA::TMVAGlob::SetSignalAndBackgroundStyle( TH1* sig, TH1* bkg, TH1* all )
{
   //signal
   // const Int_t FillColor__S = 38 + 150; // change of Color Scheme in ROOT-5.16.
   // convince yourself with gROOT->GetListOfColors()->Print()
   Int_t FillColor__S = getSignalFill();
   Int_t FillStyle__S = 1001;
   Int_t LineColor__S = getSignalLine();
   Int_t LineWidth__S = 2;

   // background
   //Int_t icolor = gConfig().fVariablePlotting.fUsePaperStyle ? 2 + 100 : 2;
   Int_t FillColor__B = getBackgroundFill();

This file has been truncated. show original

You should be able to modify it as you wish. If you have same specific questions about the graphic style, @couet should be able to help you

Lorenzo

ruimig · September 3, 2023, 5:40pm

Thank you for your response. However I’ve noticed something : while this file is present in the regular x64 versions of ROOT, it appears to be missing in versions designed for an ARM architecture on MacOs (which does not even have the regular TMVA folder in the ROOT source directory). Can anyone provide insights into this issue?