Specify minimum/maximum colour for colour palette

ROOT
1

In this example:

  gStyle -> SetOptStat(0);
  gStyle -> SetOptTitle(0);
  TH2 * h = new TH2F("h2", "h2", 2, 0.0, 2.0, 2, 0.0, 2.0);
  h -> SetBinContent(2, 2, 100);
  h -> SetBinContent(1, 2, 50);
  h -> SetBinContent(2, 1, - 25);
  TCanvas * c = new TCanvas;
  h -> Draw("COLZ");

the output is:

gradiencolor
gradiencolor698×475 3.92 KB

I would like to specify and show on the colour palette the colour corresponding to -100 even if there is no bin with such minimum value in the TH2. How can I do that?

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2

Hi,

Try to set h->SetMinimum(-100);.

Regards,
Sergey

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