ROOT

ROOT is a historical library created in 1994. ROOT is an object-oriented program and library developed by CERN. It was originally designed for particle physics data analysis and contains several features specific to this field, but it is also used in other applications such as astronomy and data mining. Release 6.14.04 as of 2018-08-23. Read more on Wikipedia...

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• ROOT ranks in the top 20% of entities I track
• the ROOT website
• the ROOT wikipedia page
• ROOT first appeared in 1994
• See also: linux, solaris, ia-32, postscript, svg, latex, python, matlab, matplotlib, scipy, numpy, perl-data-language, perl, r, igor-pro
• I have 28 facts about ROOT. what would you like to know? email me and let me know how I can help.

Example code from the web:

#include "Riostream.h"
void basic() {
// read file $ROOTSYS/tutorials/tree/basic.dat
// this file has 3 columns of float data
   TString dir = gROOT->GetTutorialDir();
   dir.Append("/tree/");
   dir.ReplaceAll("/./","/");
   ifstream in;
   in.open(Form("%sbasic.dat",dir.Data()));
   Float_t x,y,z;
   Int_t nlines = 0;
   auto f = TFile::Open("basic.root","RECREATE");
   TH1F h1("h1","x distribution",100,-4,4);
   TNtuple ntuple("ntuple","data from ascii file","x:y:z");
   while (1) {
      in >> x >> y >> z;
      if (!in.good()) break;
      if (nlines < 5) printf("x=%8f, y=%8f, z=%8f\n",x,y,z);
      h1.Fill(x);
      ntuple.Fill(x,y,z);
      nlines++;
   }
   printf(" found %d points\n",nlines);
   in.close();
   f->Write();
}

Last updated July 22nd, 2019