Error: redefinition of a variable

[spyhunter01]

@ferhue

You need to create a TFile, and write the canvas to the TFile using c->Write();

I am also curios why this bash file doesn’t work.

#!/bin/bash

yourPath=“PATH/”

root -l ${yourPath}plots.root -e “new TBrowser”

TFile *file = TFile::Open("${yourPath}plots.root");
if (!file) {
    std::cerr << "Error: Could not open plots.root" << std::endl;
    return 1;
}

TGraph *graph1 = (TGraph*)file->Get("mg0");
TGraph *graph2 = (TGraph*)file->Get("mg1");

TCanvas *c1 = new TCanvas("c1", "Graph 1", 800, 600);
graph1->Draw("AL");

TCanvas *c2 = new TCanvas("c2", "Graph 2", 800, 600);
graph2->Draw("AL");

[ferhue]

You can use graph- write instead of canvas write, and then use Draw option “same” in TBrowser when double clicking. This way they will all be added to the same canvas.

There is no way to show them without clicking. Apart from writing another script.

[ferhue]

You are mixing bash and C++.

Instead, create a macro called openPlots.cpp and there you put the C++ code where you open the TFile.

From bash just remove the new Tbrowser stuff and just call root openPlots.cpp -l

[spyhunter01]

Worked. Thank you so much.