SetLogy issue

ROOT
1

Hi,
I have a TGraphErrors graph. Values of the points on the graph are very small, 1e-12 to 1e-5. When I set

gPad->SetLogy()

only the part with large values are shown. I attach a snapshot and its root file here.

I suspect SetLogy() has a range requirement… Any hint?

Thanks.
test.root (5.59 KB)

root_issue.png1318×498 15.7 KB

2

try to use graph->SetMinimum(1.e-13);

3

It doesn’t work to me. I am trying to understand why the y axis range cannot be automatically and properly set …

4

the Y data is 0 in some points.
it will be some trouble when use SetLogy.

{
  gROOT->Reset();
  TFile f = TFile("test.root");  
  TCanvas* c1 = new TCanvas("c1", "  ");
  TGraphErrors* hist1 = (TGraphErrors*)f.Get("gTally14");
  hist1->Draw("ap");
hist1->SetMinimum(1.e-25);
  c1->SetLogy(1);
  
  hist1->Print();
}
5 
{
  TFile *f = new TFile("test.root");
  TCanvas* c1 = new TCanvas("c1", "  ");
  TGraphErrors* hist1 = (TGraphErrors*)f->Get("gTally14");
  hist1->Draw("ap");
  hist1->SetMinimum(1E-12);
  c1->SetLogy(1);
}

Gives me:

c1.png698×475 12.8 KB