doc/v632/basic2_8C.html

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();

}

f
#define f(i)
Definition RSha256.hxx:104

Long64_t
long long Long64_t
Definition RtypesCore.h:80

TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition TCollection.h:358

gROOT
#define gROOT
Definition TROOT.h:414

Form
char * Form(const char *fmt,...)
Formats a string in a circular formatting buffer.
Definition TString.cxx:2489

ROOT::Detail::TRangeCast
Definition TCollection.h:311

TFile
A ROOT file is an on-disk file, usually with extension .root, that stores objects in a file-system-li...
Definition TFile.h:53

TH1F
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:621

TString
Basic string class.
Definition TString.h:139

TTree
A TTree represents a columnar dataset.
Definition TTree.h:79

h1
TH1F * h1
Definition legend1.C:5