TMultiGraph.SetMinimum ignored in batch mode

ROOT
,
1

In the following code, the graphs.SetMinimum(0) and graphs.SetMaximum(10) are ignored, if you look at the saved .png image.

import ROOT

ROOT.gROOT.SetBatch(True)

canvas = ROOT.TCanvas("canv0", "Graphs", 0,0,936,860)
graphs = ROOT.TMultiGraph()

graph = ROOT.TGraph()
graph.SetPoint(0,1,1)
graph.SetPoint(1,2,2)
graphs.Add(graph, "l")
graphs.Draw("A")

graphs.SetMinimum(0)
graphs.SetMaximum(10)

graphs.GetXaxis().SetLimits(0,3)

canvas.Update()
canvas.SaveAs("test_graph.png")

This can be fixed either by not running in batch mode, or by setting the x axis limits before the graphs.Setminimum(0). Is it a bug that only in batch mode it demands a certain ordering of the commands?

ROOT Version: current master branch
Platform: Ubuntu 18.04
Compiler: gcc 7.4
Python: 3.6.8

2

Try: graphs.GetHistogram().SetWhatever(...)

3

it works for me with :slight_smile:

{
   gROOT->SetBatch(kTRUE);
   auto graphs = new TMultiGraph();
   auto canvas = new TCanvas("c1", "Graphs", 10,10, 1200,800);

   auto graph = new TGraph();
   graph->SetPoint(0,1,1);
   graph->SetPoint(1,2,2);

   graphs->Add(graph, "l");
   graphs->Draw("A");
   auto xaxis = graphs->GetXaxis();
   xaxis->SetLimits(0, 3);

   canvas->SaveAs("test_saveas.png");
}
4

In the meantime I have recompiled ROOT, and currently the code in the OP no longer produces any problems for me, not sure what was going on.