logN.cxx File Reference

Detailed Description

Logarithmic scales support in web canvas.

Shows support of log2, ln, log8 and log25 scales Any integer base for logarithm can be specified as well

Functionality available only in web-based graphics

 
void logN()
{
   auto h1 = new TH1I("hist", "Random data", 100, -5, 5);
   h1->FillRandom("gaus", 10000);
 
   auto c1 = new TCanvas("c1", "Logarithmic scales", 1200, 800);
 
   if (!gROOT->IsBatch() && !c1->IsWeb())
      ::Warning("logN.cxx", "macro will not work without enabling web-based canvas");
 
   c1->Divide(2, 2);
 
   c1->GetPad(1)->SetLogy(2);  // configure log2
   c1->GetPad(1)->Add(h1, ""); // draw with default draw option
 
   c1->GetPad(2)->SetLogy(3);   // configure ln - 3 is special case
   c1->GetPad(2)->Add(h1, "l"); // draw histogram as line
 
   c1->GetPad(3)->SetLogy(8);   // configure log8
   c1->GetPad(3)->Add(h1, "c"); // draw histogram as curve
 
   c1->GetPad(4)->SetLogy(25);  // configure log25
   c1->GetPad(4)->Add(h1, "E"); // draw histogram as errors
}

Author

Sergey Linev

Definition in file logN.cxx.