library: libTree #include "TNtuple.h"

# TNtuple

class description - source file - inheritance tree (.pdf)

## class TNtuple : public TTree

| Inheritance Chart:

`TObject`

<-

`TNamed`

`TAttLine`

`TAttFill`

`TAttMarker`

<-

`TTree`

<-

`TNtuple`

        protected:

          virtual Int_t Fill()

        public:

                           TNtuple()
                           TNtuple(const char* name, const char* title, const char* varlist, Int_t bufsize = 32000)
                   virtual ~TNtuple()
              virtual void Browse(TBrowser* b)
            static TClass* Class()
             virtual Int_t Fill(const Float_t* x)
                     Int_t Fill(Int_t x0)
                     Int_t Fill(Double_t x0)
             virtual Int_t Fill(Float_t x0, Float_t x1 = 0, Float_t x2 = 0, Float_t x3 = 0, Float_t x4 = 0, Float_t x5 = 0, Float_t x6 = 0, Float_t x7 = 0, Float_t x8 = 0, Float_t x9 = 0, Float_t x10 = 0, Float_t x11 = 0, Float_t x12 = 0, Float_t x13 = 0, Float_t x14 = 0)
                  Float_t* GetArgs() const
             virtual Int_t GetNvar() const
           virtual TClass* IsA() const
          virtual Long64_t ReadFile(const char* filename, const char* branchDescriptor = "")
              virtual void ResetBranchAddresses()
              virtual void ShowMembers(TMemberInspector& insp, char* parent)
              virtual void Streamer(TBuffer& b)
                      void StreamerNVirtual(TBuffer& b)

### Data Members

        protected:

             Int_t fNvar  Number of columns
          Float_t* fArgs  ! [fNvar] Array of variables

## Class Description

     TNtuple

     A simple tree restricted to a list of float variables only.

     Each variable goes to a separate branch.

      A Ntuple is created via
         TNtuple(name,title,varlist,bufsize)
      It is filled via:
         TNtuple::Fill(*x)  or
         TNtuple::Fill(v1,v2,v3.....)

TNtuple(): TTree()

    *-*-*-*-*-*Default constructor for Ntuple*-*-*-*-*-*-*-*-*-*-*-*-*-*
    *-*        ==============================

TNtuple(const char *name, const char *title, const char *varlist, Int_t bufsize) :TTree(name,title)

    *-*-*-*-*-*-*-*-*-*-*-*-*Create an Ntuple*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
    *-*                      ================
           The parameter varlist describes the list of the ntuple variables
           separated by a colon:
             example:  "x:y:z:energy"
           For each variable in the list a separate branch is created.

           Use TTree to create branches with variables of different data types.
    *-*

~TNtuple()

    *-*-*-*-*-*Default destructor for an Ntuple*-*-*-*-*-*-*-*-*-*-*-*
    *-*        ================================

void ResetBranchAddresses()

     Reset the branch addresses to the internal fArgs array. Use this
     method when the addresses were changed via calls to SetBranchAddress().

void Browse(TBrowser *b)

Int_t Fill()

    *-*-*-*-*-*-*-*-*Fill a Ntuple with current values in fArgs*-*-*-*-*-*-*
    *-*              ==========================================
     Note that this function is protected.
     Currently called only by TChain::Merge

Int_t Fill(const Float_t *x)

     Fill a Ntuple with an array of floats

Int_t Fill(Float_t x0,Float_t x1,Float_t x2,Float_t x3,Float_t x4 ,Float_t x5,Float_t x6,Float_t x7,Float_t x8,Float_t x9 ,Float_t x10,Float_t x11,Float_t x12,Float_t x13,Float_t x14)

     Fill a Ntuple: Each Ntuple item is an argument

Long64_t ReadFile(const char *filename, const char * /*branchDescriptor*/)

     Read from filename as many columns as variables in the ntuple
     the function returns the number of rows found in the file
     The second argument "branchDescriptor" is currently not used.
     Lines in the input file starting with "#" are ignored.

void Streamer(TBuffer &b)

    *-*-*-*-*-*-*-*-*Stream a class object*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
    *-*              =========================================

### Inline Functions

                  Int_t Fill(Double_t x0)
                  Int_t Fill(Float_t x0, Float_t x1 = 0, Float_t x2 = 0, Float_t x3 = 0, Float_t x4 = 0, Float_t x5 = 0, Float_t x6 = 0, Float_t x7 = 0, Float_t x8 = 0, Float_t x9 = 0, Float_t x10 = 0, Float_t x11 = 0, Float_t x12 = 0, Float_t x13 = 0, Float_t x14 = 0)
                  Int_t GetNvar() const
               Float_t* GetArgs() const
                TClass* Class()
                TClass* IsA() const
                   void ShowMembers(TMemberInspector& insp, char* parent)
                   void StreamerNVirtual(TBuffer& b)

Author: Rene Brun 06/04/96
Last update: root/tree:$Name: $:$Id: TNtuple.cxx,v 1.10 2005/04/07 10:57:32 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *