TTreePlayer


class description - source file - inheritance tree

class TTreePlayer : public TVirtualTreePlayer


    protected:
const char* GetNameByIndex(TString& varexp, Int_t* index, Int_t colindex) const virtual void MakeIndex(TString& varexp, Int_t* index) void TakeAction(Int_t nfill, Int_t& npoints, Int_t& action, TObject* obj, Option_t* option) void TakeEstimate(Int_t nfill, Int_t& npoints, Int_t action, TObject* obj, Option_t* option) public:
TTreePlayer TTreePlayer() TTreePlayer TTreePlayer(TTreePlayer&) virtual void ~TTreePlayer() TClass* Class() virtual void ClearFormula() virtual void CompileVariables(const char* varexp, const char* selection) virtual TTree* CopyTree(const char* selection, Option_t* option, Int_t nentries = 1000000000, Int_t firstentry = 0) virtual void CreatePacketGenerator(Int_t nentries, Stat_t firstEntry) virtual void DrawSelect(const char* varexp, const char* selection, Option_t* option, Int_t nentries = 1000000000, Int_t firstentry = 0) virtual void EntryLoop(Int_t& action, TObject* obj, Int_t nentries = 1000000000, Int_t firstentry = 0, Option_t* option) virtual void EstimateLimits(Int_t estimate, Int_t nentries = 1000000000, Int_t firstentry = 0) void FindGoodLimits(Int_t nbins, Int_t& newbins, Float_t& xmin, Float_t& xmax) virtual void Fit(const char* formula, const char* varexp, const char* selection, Option_t* option, Option_t* goption, Int_t nentries, Int_t firstentry) virtual TH1* GetHistogram() TTreeFormula* GetMultiplicity() virtual void GetNextPacket(TSlave* sl, Int_t& nentries, Stat_t& firstentry, Stat_t& processed) TPacketGenerator* GetPacketGenerator() const virtual Int_t GetPacketSize() const virtual TTreeFormula* GetSelect() virtual Int_t GetSelectedRows() TSelector* GetSelector() virtual Float_t* GetV1() virtual Float_t* GetV2() virtual Float_t* GetV3() virtual TTreeFormula* GetVar1() virtual TTreeFormula* GetVar2() virtual TTreeFormula* GetVar3() virtual TTreeFormula* GetVar4() virtual Double_t* GetW() virtual TClass* IsA() const virtual void Loop(Option_t* option, Int_t nentries = 1000000000, Int_t firstentry = 0) virtual Int_t MakeClass(const char* classname = 0) virtual Int_t MakeCode(const char* filename = 0) virtual TSQLResult* Query(const char* varexp, const char* selection, Option_t* option, Int_t nentries = 1000000000, Int_t firstentry = 0) virtual void Scan(const char* varexp, const char* selection, Option_t* option, Int_t nentries = 1000000000, Int_t firstentry = 0) virtual void SetEstimate(Int_t n) virtual void SetPacketSize(Int_t size = 100) virtual void SetSelector(const char* macroname) virtual void SetSelector(TSelector* selector = 0) virtual void SetTree(TTree* t) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void StartViewer(Int_t ww, Int_t wh) virtual void Streamer(TBuffer& b)

Data Members

protected:
TTree* fTree Pointer to current Tree Int_t fDraw Last entry loop number when object was drawn TTreeFormula* fVar1 Pointer to first variable formula TTreeFormula* fVar2 Pointer to second variable formula TTreeFormula* fVar3 Pointer to third variable formula TTreeFormula* fVar4 Pointer to fourth variable formula TTreeFormula* fSelect Pointer to selection formula TTreeFormula* fMultiplicity Pointer to formula giving ndata per entry Int_t fDimension Dimension of the current expression Int_t fSelectedRows Number of selected entries Int_t fPacketSize Number of entries in one packet for parallel root Int_t fNbins[4] Number of bins per dimension Float_t fVmin[4] Minima of varexp columns Float_t fVmax[4] Maxima of varexp columns Float_t* fV1 Local buffer for variable 1 Float_t* fV2 Local buffer for variable 2 Float_t* fV3 Local buffer for variable 3 Double_t* fW Local buffer for weights TSelector* fSelector Pointer to current selector TPacketGenerator* fPacketGen Packet generator Int_t fNfill Local for EntryLoop TH1* fHistogram Pointer to histogram used for the projection

Class Description

                                                                      
 TTree                                                                
                                                                      
  a TTree object has a header with a name and a title.
  It consists of a list of independent branches (TBranch). Each branch
  has its own definition and list of buffers. Branch buffers may be
  automatically written to disk or kept in memory until the Tree attribute
  fMaxVirtualSize is reached.
  Variables of one branch are written to the same buffer.
  A branch buffer is automatically compressed if the file compression
  attribute is set (default).

  Branches may be written to different files (see TBranch::SetFile).

  The ROOT user can decide to make one single branch and serialize one
  object into one single I/O buffer or to make several branches.
  Making one single branch and one single buffer can be the right choice
  when one wants to process only a subset of all entries in the tree.
  (you know for example the list of entry numbers you want to process).
  Making several branches is particularly interesting in the data analysis
  phase, when one wants to histogram some attributes of an object (entry)
  without reading all the attributes.

/*

*/


  ==> TTree *tree = new TTree(name, title, maxvirtualsize)
     Creates a Tree with name and title. Maxvirtualsize is by default 64Mbytes,
     maxvirtualsize = 64000000(default) means: Keeps as many buffers in memory until
     the sum of all buffers is greater than 64 Megabyte. When this happens,
     memory buffers are written to disk and deleted until the size of all
     buffers is again below the threshold.
     maxvirtualsize = 0 means: keep only one buffer in memory.

     Various kinds of branches can be added to a tree:
       A - simple structures or list of variables. (may be for C or Fortran structures)
       B - any object (inheriting from TObject). (we expect this option be the most frequent)
       C - a ClonesArray. (a specialized object for collections of same class objects)

  ==> Case A
      ======
     TBranch *branch = tree->Branch(branchname,address, leaflist, bufsize)
       * address is the address of the first item of a structure
       * leaflist is the concatenation of all the variable names and types
         separated by a colon character :
         The variable name and the variable type are separated by a slash (/).
         The variable type may be 0,1 or 2 characters. If no type is given,
         the type of the variable is assumed to be the same as the previous
         variable. If the first variable does not have a type, it is assumed
         of type F by default. The list of currently supported types is given below:
            - C : a character string terminated by the 0 character
            - B : an 8 bit signed integer (Char_t)
            - b : an 8 bit unsigned integer (UChar_t)
            - S : a 16 bit signed integer (Short_t)
            - s : a 16 bit unsigned integer (UShort_t)
            - I : a 32 bit signed integer (Int_t)
            - i : a 32 bit unsigned integer (UInt_t)
            - F : a 32 bit floating point (Float_t)
            - D : a 64 bit floating point (Double_t)

  ==> Case B
      ======
     TBranch *branch = tree->Branch(branchname,className,object, bufsize, splitlevel)
          object is the address of a pointer to an existing object (derived from TObject).
        if splitlevel=1 (default), this branch will automatically be split
          into subbranches, with one subbranch for each data member or object
          of the object itself. In case the object member is a TClonesArray,
          the mechanism described in case C is applied to this array.
        if splitlevel=0, the object is serialized in the branch buffer.

  ==> Case C
      ======
     TBranch *branch = tree->Branch(branchname,clonesarray, bufsize, splitlevel)
         clonesarray is the address of a pointer to a TClonesArray.
         The TClonesArray is a direct access list of objects of the same class.
         For example, if the TClonesArray is an array of TTrack objects,
         this function will create one subbranch for each data member of
         the object TTrack.


  ==> branch->SetAddress(Void *address)
      In case of dynamic structures changing with each entry for example, one must
      redefine the branch address before filling the branch again.
      This is done via the TBranch::SetAddress member function.

  ==> tree->Fill()
      loops on all defined branches and for each branch invokes the Fill function.

         See also the class TNtuple (a simple Tree with only one branch)

/*

*/

  =============================================================================
______________________________________________________________________________
*-*-*-*-*-*-*A simple example with histograms and a tree*-*-*-*-*-*-*-*-*-*
*-*          ===========================================

  This program creates :
    - a one dimensional histogram
    - a two dimensional histogram
    - a profile histogram
    - a tree

  These objects are filled with some random numbers and saved on a file.

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

 #include "TROOT.h"
 #include "TFile.h"
 #include "TH1.h"
 #include "TH2.h"
 #include "TProfile.h"
 #include "TRandom.h"
 #include "TTree.h"


 TROOT simple("simple","Histograms and trees");

 //______________________________________________________________________________
 main(int argc, char **argv)
 {
 // Create a new ROOT binary machine independent file.
 // Note that this file may contain any kind of ROOT objects, histograms,trees
 // pictures, graphics objects, detector geometries, tracks, events, etc..
 // This file is now becoming the current directory.
   TFile hfile("htree.root","RECREATE","Demo ROOT file with histograms & trees");

 // Create some histograms and a profile histogram
   TH1F *hpx   = new TH1F("hpx","This is the px distribution",100,-4,4);
   TH2F *hpxpy = new TH2F("hpxpy","py ps px",40,-4,4,40,-4,4);
   TProfile *hprof = new TProfile("hprof","Profile of pz versus px",100,-4,4,0,20);

 // Define some simple structures
   typedef struct {Float_t x,y,z;} POINT;
   typedef struct {
      Int_t ntrack,nseg,nvertex;
      UInt_t flag;
      Float_t temperature;
   } EVENTN;
   static POINT point;
   static EVENTN eventn;

 // Create a ROOT Tree
   TTree *tree = new TTree("T","An example of ROOT tree with a few branches");
   tree->Branch("point",&point,"x:y:z");
   tree->Branch("eventn",&eventn,"ntrack/I:nseg:nvertex:flag/i:temperature/F");
   tree->Branch("hpx","TH1F",&hpx,128000,0);

   Float_t px,py,pz;
   static Float_t p[3];

 //--------------------Here we start a loop on 1000 events
   for ( Int_t i=0; i<1000; i++) {
      gRandom->Rannor(px,py);
      pz = px*px + py*py;
      Float_t random = gRandom->::Rndm(1);

 //         Fill histograms
      hpx->Fill(px);
      hpxpy->Fill(px,py,1);
      hprof->Fill(px,pz,1);

 //         Fill structures
      p[0] = px;
      p[1] = py;
      p[2] = pz;
      point.x = 10*(random-1);;
      point.y = 5*random;
      point.z = 20*random;
      eventn.ntrack  = Int_t(100*random);
      eventn.nseg    = Int_t(2*eventn.ntrack);
      eventn.nvertex = 1;
      eventn.flag    = Int_t(random+0.5);
      eventn.temperature = 20+random;

 //        Fill the tree. For each event, save the 2 structures and 3 objects
 //      In this simple example, the objects hpx, hprof and hpxpy are slightly
 //      different from event to event. We expect a big compression factor!
      tree->Fill();
   }
  //--------------End of the loop

   tree->Print();

 // Save all objects in this file
   hfile.Write();

 // Close the file. Note that this is automatically done when you leave
 // the application.
   hfile.Close();

   return 0;
 }
                                                                      


TTreePlayer()
*-*-*-*-*-*-*-*-*-*-*Default Tree constructor*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ========================

~TTreePlayer()
*-*-*-*-*-*-*-*-*-*-*Tree destructor*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  =================

void ClearFormula()
*-*-*-*-*-*-*Delete internal buffers*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*          =======================

void CompileVariables(const char *varexp, const char *selection)
*-*-*-*-*-*-*Compile input variables and selection expression*-*-*-*-*-*
*-*          ================================================

  varexp is an expression of the general form e1:e2:e3
    where e1,etc is a formula referencing a combination of the columns
  Example:
     varexp = x     simplest case: draw a 1-Dim distribution of column named x
            = sqrt(x)            : draw distribution of sqrt(x)
            = x*y/z
            = y:sqrt(x) 2-Dim dsitribution of y versus sqrt(x)

  selection is an expression with a combination of the columns
  Example:
      selection = "x<y && sqrt(z)>3.2"
       in a selection all the C++ operators are authorized



TTree* CopyTree(const char *selection, Option_t *option, Int_t nentries, Int_t firstentry)
 copy a Tree with selection
 make a clone of this Tree header.
 then copy the selected entries

 selection is a standard selection expression (see TTreePlayer::Draw)
 option is reserved for possible future use
 nentries is the number of entries to process (default is all)
 first is the first entry to process (default is 0)

 Note that the branch addresses must be correctly set before calling this function
 The following example illustrates how to copy some events from the Tree
 generated in $ROOTSYS/test/Event

   gSystem->Load("libEvent");
   TFile f("Event.root");
   TTree *T = (TTree*)f.Get("T");
   Event *event = new Event();
   T->SetBranchAddress("event",&event);
   TFile f2("Event2.root","recreate");
   TTree *T2 = T->CopyTree("fNtrack<595");
   T2->Write();

void CreatePacketGenerator(Int_t nentries, Stat_t firstEntry)
 Create or reset the packet generator.

void DrawSelect(const char *varexp0, const char *selection, Option_t *option,Int_t nentries, Int_t firstentry)
*-*-*-*-*-*-*-*-*-*-*Draw expression varexp for specified entries-*-*-*-*-*
*-*                  ===========================================

  varexp is an expression of the general form e1:e2:e3
    where e1,etc is a formula referencing a combination of the columns
  Example:
     varexp = x     simplest case: draw a 1-Dim distribution of column named x
            = sqrt(x)            : draw distribution of sqrt(x)
            = x*y/z
            = y:sqrt(x) 2-Dim dsitribution of y versus sqrt(x)
  Note that the variables e1, e2 or e3 may contain a selection.
  example, if e1= x*(y<0), the value histogrammed will be x if y<0
  and will be 0 otherwise.

  selection is an expression with a combination of the columns.
  In a selection all the C++ operators are authorized.
  The value corresponding to the selection expression is used as a weight
  to fill the histogram.
  If the expression includes only boolean operations, the result
  is 0 or 1. If the result is 0, the histogram is not filled.
  In general, the expression may be of the form:
      value*(boolean expression)
  if boolean expression is true, the histogram is filled with
  a weight = value.
  Examples:
      selection1 = "x<y && sqrt(z)>3.2"
      selection2 = "(x+y)*(sqrt(z)>3.2"
  selection1 returns a weigth = 0 or 1
  selection2 returns a weight = x+y if sqrt(z)>3.2
             returns a weight = 0 otherwise.

  option is the drawing option
      see TH1::Draw for the list of all drawing options.
      If option contains the string "goff", no graphics is generated.

  nentries is the number of entries to process (default is all)
  first is the first entry to process (default is 0)

     Saving the result of Draw to an histogram
     =========================================
  By default the temporary histogram created is called htemp.
  If varexp0 contains >>hnew (following the variable(s) name(s),
  the new histogram created is called hnew and it is kept in the current
  directory.
  Example:
    tree.Draw("sqrt(x)>>hsqrt","y>0")
    will draw sqrt(x) and save the histogram as "hsqrt" in the current
    directory.

  By default, the specified histogram is reset.
  To continue to append data to an existing histogram, use "+" in front
  of the histogram name;
    tree.Draw("sqrt(x)>>+hsqrt","y>0")
      will not reset hsqrt, but will continue filling.
  This works for 1-D, 2-D and 3-D histograms.

     Making a Profile histogram
     ==========================
  In case of a 2-Dim expression, one can generate a TProfile histogram
  instead of a TH2F histogram by specyfying option=prof or option=profs.
  The option=prof is automatically selected in case of y:x>>pf
  where pf is an existing TProfile histogram.

     Saving the result of Draw to a TEventList
     =========================================
  TTree::Draw can be used to fill a TEventList object (list of entry numbers)
  instead of histogramming one variable.
  If varexp0 has the form >>elist , a TEventList object named "elist"
  is created in the current directory. elist will contain the list
  of entry numbers satisfying the current selection.
  Example:
    tree.Draw(">>yplus","y>0")
    will create a TEventList object named "yplus" in the current directory.
    In an interactive session, one can type (after TTree::Draw)
       yplus.Print("all")
    to print the list of entry numbers in the list.

  By default, the specified entry list is reset.
  To continue to append data to an existing list, use "+" in front
  of the list name;
    tree.Draw(">>+yplus","y>0")
      will not reset yplus, but will enter the selected entries at the end
      of the existing list.

      Using a TEventList as Input
      ===========================
  Once a TEventList object has been generated, it can be used as input
  for TTree::Draw. Use TTree::SetEventList to set the current event list
  Example:
     TEventList *elist = (TEventList*)gDirectory->Get("yplus");
     tree->SetEventList(elist);
     tree->Draw("py");

  Note: Use tree->SetEventList(0) if you do not want use the list as input.

      How to obtain more info from TTree::Draw
      ========================================

  Once TTree::Draw has been called, it is possible to access useful
  information still stored in the TTree object via the following functions:
    -GetSelectedRows()    // return the number of entries accepted by the
                          //selection expression. In case where no selection
                          //was specified, returns the number of entries processed.
    -GetV1()              //returns a pointer to the float array of V1
    -GetV2()              //returns a pointer to the float array of V2
    -GetV3()              //returns a pointer to the float array of V3
    -GetW()               //returns a pointer to the double array of Weights
                          //where weight equal the result of the selection expression.
   where V1,V2,V3 correspond to the expressions in
   TTree::Draw("V1:V2:V3",selection);

   Example:
    Root > ntuple->Draw("py:px","pz>4");
    Root > TGraph *gr = new TGraph(ntuple->GetSelectedRows(),
                                   ntuple->GetV2(), ntuple->GetV1());
    Root > gr->Draw("ap"); //draw graph in current pad
    creates a TGraph object with a number of points corresponding to the
    number of entries selected by the expression "pz>4", the x points of the graph
    being the px values of the Tree and the y points the py values.

   Important note: By default TTree::Draw creates the arrays obtained
    with GetV1, GetV2, GetV3, GetW with a length corresponding to the
    parameter fEstimate. By default fEstimate=10000 and can be modified
    via TTree::SetEstimate. A possible recipee is to do
       tree->SetEstimate(tree->GetEntries());
    You must call SetEstimate if the expected number of selected rows
    is greater than 10000.

    You can use the option "goff" to turn off the graphics output
    of TTree::Draw in the above example.

           Automatic interface to TTree::Draw via the TTreeViewer
           ======================================================

    A complete graphical interface to this function is implemented
    in the class TTreeViewer.
    To start the TTreeViewer, three possibilities:
       - select TTree context menu item "StartViewer"
       - type the command  "TTreeViewer TV(treeName)"
       - execute statement "tree->StartViewer();"


void EntryLoop(Int_t &action, TObject *obj, Int_t nentries, Int_t firstentry, Option_t *option)
*-*-*-*-*-*-*-*-*-*-*-*-*Loop on all entries*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                      ==================

  nentries is the number of entries to process (default is all)
  first is the first entry to process (default is 0)

  action =  1  Fill 1-D histogram obj
         =  2  Fill 2-D histogram obj
         =  3  Fill 3-D histogram obj
         =  4  Fill Profile histogram obj
         =  5  Fill a TEventlist
         = 11  Estimate Limits
         = 12  Fill 2-D PolyMarker obj
         = 13  Fill 3-D PolyMarker obj
  action < 0   Evaluate Limits for case abs(action)


void EstimateLimits(Int_t, Int_t nentries, Int_t firstentry)
*-*-*-*-*Estimate histogram limits for conditions of input parameters*-*-*-*
*-*      ============================================================

  The estimation of the limits is based on estimate entries
  The first estimate/2 and the last esstimate/2 entries are used.
  This algorithm is in general good enough to make a reasonable estimation
  with a small number of entries.

  nentries is the number of entries to process (default is all)
  first is the first entry to process (default is 0)


void FindGoodLimits(Int_t nbins, Int_t &newbins, Float_t &xmin, Float_t &xmax)
*-*-*-*-*-*-*-*-*Find reasonable bin values*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*              ==========================

void Fit(const char *formula ,const char *varexp, const char *selection,Option_t *option ,Option_t *goption,Int_t nentries, Int_t firstentry)
*-*-*-*-*-*-*-*-*Fit  a projected item(s) from a Tree*-*-*-*-*-*-*-*-*-*
*-*              ======================================

  formula is a TF1 expression.

  See TTree::Draw for explanations of the other parameters.

  By default the temporary histogram created is called htemp.
  If varexp contains >>hnew , the new histogram created is called hnew
  and it is kept in the current directory.
  Example:
    tree.Fit(pol4,sqrt(x)>>hsqrt,y>0)
    will fit sqrt(x) and save the histogram as "hsqrt" in the current
    directory.


const char* GetNameByIndex(TString &varexp, Int_t *index,Int_t colindex)
*-*-*-*-*-*-*-*-*Return name corresponding to colindex in varexp*-*-*-*-*-*
*-*              ===============================================

   varexp is a string of names separated by :
   index is an array with pointers to the start of name[i] in varexp


void GetNextPacket(TSlave *sl, Int_t &nentries, Stat_t &firstentry, Stat_t &processed)
 Return in nentries and firstentry the optimal range of entries (packet)
 to be processed by slave sl. See TPacketGenerator for the algorithm
 used to get the packet size.

TSelector* GetSelector()
*-*-*-*-*-*Return current selector or create default selector
*-*        ==================================================

void Loop(Option_t *option, Int_t nentries, Int_t firstentry)
*-*-*-*-*-*-*-*-*Loop on nentries of this tree starting at firstentry
*-*              ===================================================

Int_t MakeClass(const char *classname)
====>
*-*-*-*-*-*-*Generate skeleton analysis class for this Tree*-*-*-*-*-*-*
*-*          ==============================================

   The following files are produced: classname.h and classname.C
   if classname is NULL, classname will be nameoftree.

   The generated code in classname.h includes the following:
      - Identification of the original Tree and Input file name
      - Definition of analysis class (data and functions)
      - the following class functions:
         -constructor (connecting by default the Tree file)
         -GetEntry(Int_t entry)
         -Init(TTree *tree) to initialize a new TTree
         -Show(Int_t entry) to read and Dump entry

   The generated code in classname.C includes only the main
   analysis function Loop.

   To use this function:
      - connect your Tree file (eg: TFile f("myfile.root");)
      - T->MakeClass("MyClass");
    where T is the name of the Tree in file myfile.root
    and MyClass.h, MyClass.C the name of the files created by this function.
   In a Root session, you can do:
      Root > .L MyClass.C
      Root > MyClass t
      Root > t.GetEntry(12); // Fill t data members with entry number 12
      Root > t.Show();       // Show values of entry 12
      Root > t.Show(16);     // Read and show values of entry 16
      Root > t.Loop();       // Loop on all entries

====>

Int_t MakeCode(const char *filename)
====>
*-*-*-*-*-*-*-*-*Generate skeleton function for this Tree*-*-*-*-*-*-*
*-*              ========================================

   The function code is written on filename
   if filename is NULL, filename will be nameoftree.C

   The generated code includes the following:
      - Identification of the original Tree and Input file name
      - Connection of the Tree file
      - Declaration of Tree variables
      - Setting of branches addresses
      - a skeleton for the entry loop

   To use this function:
      - connect your Tree file (eg: TFile f("myfile.root");)
      - T->MakeCode("anal.C");
    where T is the name of the Tree in file myfile.root
    and anal.C the name of the file created by this function.

   NOTE: Since the implementation of this function, a new and better
         function TTreePlayer::MakeClass has been developped.

          Author: Rene Brun
====>

void MakeIndex(TString &varexp, Int_t *index)
*-*-*-*-*-*-*-*-*Build Index array for names in varexp*-*-*-*-*-*-*-*-*-*-*
*-*              =====================================

void Scan(const char *varexp, const char *selection, Option_t *, Int_t nentries, Int_t firstentry)
 Loop on Tree and print entries passing selection. If varexp is 0 (or "")
 then print only first 8 columns. If varexp = "*" print all columns.
 Otherwise a columns selection can be made using "var1:var2:var3".

TSQLResult* Query(const char *varexp, const char *selection, Option_t *, Int_t nentries, Int_t firstentry)
 Loop on Tree and return TSQLResult object containing entries passing
 selection. If varexp is 0 (or "") then print only first 8 columns.
 If varexp = "*" print all columns. Otherwise a columns selection can
 be made using "var1:var2:var3". In case of error 0 is returned otherwise
 a TSQLResult object which must be deleted by the user.

void SetEstimate(Int_t )
*-*-*-*-*-*-*-*-*Set number of entries to estimate variable limits*-*-*-*
*-*              ================================================


void SetPacketSize(Int_t size)
*-*-*-*-*-*-*-*-*Set number of entries per packet for parallel root*-*-*-*-*
*-*              =================================================

void SetSelector(TSelector *selector)
*-*-*-*-*-*-*-*-*Set current selector to user selector*-*-*-*-*-*-*-*
*-*              =====================================


void SetSelector(const char *macroname)
*-*-*-*-*-*-*-*-*Set current selector to macroname*-*-*-*-*-*-*-*
*-*              =================================


void StartViewer(Int_t ww, Int_t wh)
*-*-*-*-*-*-*-*-*Start the TTreeViewer on this TTree*-*-*-*-*-*-*-*-*-*
*-*              ===================================

  ww is the width of the canvas in pixels
  wh is the height of the canvas in pixels

void TakeAction(Int_t nfill, Int_t &npoints, Int_t &action, TObject *obj, Option_t *option)
*-*-*-*-*-*Execute action for object obj nfill times*-*-*-*-*-*-*-*-*-*
*-*        =========================================

void TakeEstimate(Int_t nfill, Int_t &, Int_t action, TObject *obj, Option_t *option)
*-*-*-*-*-*Estimate limits for 1-D, 2-D or 3-D objects*-*-*-*-*-*-*-*-*-*
*-*        ===========================================



Inline Functions


                     TH1* GetHistogram()
            TTreeFormula* GetMultiplicity()
        TPacketGenerator* GetPacketGenerator() const
                    Int_t GetPacketSize() const
            TTreeFormula* GetSelect()
                    Int_t GetSelectedRows()
            TTreeFormula* GetVar1()
            TTreeFormula* GetVar2()
            TTreeFormula* GetVar3()
            TTreeFormula* GetVar4()
                 Float_t* GetV1()
                 Float_t* GetV2()
                 Float_t* GetV3()
                Double_t* GetW()
                     void SetTree(TTree* t)
                  TClass* Class()
                  TClass* IsA() const
                     void ShowMembers(TMemberInspector& insp, char* parent)
                     void Streamer(TBuffer& b)
              TTreePlayer TTreePlayer(TTreePlayer&)


Author: Rene Brun 12/01/96
Last update: 2.23/12 26/01/2000 15.34.36 by Rene Brun
Copyright (c) 1995-1999, The ROOT System, All rights reserved. *


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