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Description

When merging two TProfile2D that have a different number of bins but are none-the-less compatible to be merged (bin boundaries align), I have noticed that the bin entries are not being preserved. Please see the reproducer below. Reproduced in ROOT master.

Reproducer

{
  TProfile2D h("h","h",1,0,1,1,0,1);
  h.SetCanExtend(TH1::kAllAxes);
  auto h2 = dynamic_cast<TProfile2D*>(h.Clone());
  h.Fill(0.5,0.5,0);
  h2->Fill(1.5,0.5,0);  

  TList l;
  l.Add(h2);
  h.Merge(&l);

  assert( h.GetEntries() == 2 ); // this is fine

  double s=0;
  for(int i=0;i<h.GetNumberOfBins();i++) s += h.GetBinEntries(i);

  assert( s == 2 ); // this fails
} 

ROOT version

all

Installation method

any

Operating system

any

Additional context

No response