Labels 2

Setting alphanumeric labels.

Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Saturday, June 25, 2022 at 08:16 AM.

In [1]:
Int_t i;
const Int_t nx = 12;
const Int_t ny = 20;
const char *month[nx]  = {"January","February","March","April",
   "May","June","July","August","September","October",
   "November","December"};
const char *people[ny] = {"Jean","Pierre","Marie","Odile",
   "Sebastien","Fons","Rene","Nicolas","Xavier","Greg",
   "Bjarne","Anton","Otto","Eddy","Peter","Pasha",
   "Philippe","Suzanne","Jeff","Valery"};
TCanvas *c1 = new TCanvas("c1","demo bin labels",
   10,10,800,800);
c1->SetGrid();
c1->SetLeftMargin(0.15);
c1->SetBottomMargin(0.15);
TH2F *h = new TH2F("h","test",nx,0,nx,ny,0,ny);
for (i=0;i<5000;i++) {
   h->Fill(gRandom->Gaus(0.5*nx,0.2*nx),
      gRandom->Gaus(0.5*ny,0.2*ny));
}
h->SetStats(0);
for (i=1;i<=nx;i++) h->GetXaxis()->SetBinLabel(i,month[i-1]);
for (i=1;i<=ny;i++) h->GetYaxis()->SetBinLabel(i,people[i-1]);
h->Draw("text");

TPaveText *pt = new TPaveText(0.6,0.85,0.98,0.98,"brNDC");
pt->SetFillColor(18);
pt->SetTextAlign(12);
pt->AddText("Use the axis Context Menu LabelsOption");
pt->AddText(" \"a\"   to sort by alphabetic order");
pt->AddText(" \">\"   to sort by decreasing values");
pt->AddText(" \"<\"   to sort by increasing values");
pt->Draw();

Draw all canvases

In [2]:
gROOT->GetListOfCanvases()->Draw()