/// \file

/// \ingroup tutorial_tree

/// \notebook -js

/// Create can ntuple reading data from an ascii file.

/// This macro is a variant of basic.C

///

/// \macro_image

/// \macro_code

///

/// \author Rene Brun

void basic2() {

TString dir = gROOT->GetTutorialDir();

dir.Append("/tree/");

dir.ReplaceAll("/./","/");

TFile *f = new TFile("basic2.root","RECREATE");

TH1F *h1 = new TH1F("h1","x distribution",100,-4,4);

TTree *T = new TTree("ntuple","data from ascii file");

Long64_t nlines = T->ReadFile(Form("%sbasic.dat",dir.Data()),"x:y:z");

printf(" found %lld points\n",nlines);

T->Draw("x","z>2");

T->Write();

}