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Revision f954f663b26b8ea4c67ef1893405e31bbd64435f authored by Rene Brun on 16 December 2002, 20:29:07 UTC, committed by Rene Brun on 16 December 2002, 20:29:07 UTC 
Add new function proposed by Jason Seely:
 
TH1 *TH1::GetAsymmetry(TH1* h2, Double_t c2, Double_t dc2)
//  return an histogram containing the asymmetry of this histogram with h2,
//  where the asymmetry is defined as:
//
//  Asymmetry = (h1 - h2)/(h1 + h2)  where h1 = this
//
//  works for 1D, 2D, etc. histograms
//  c2 is an optional argument that gives a relative weight between the two
//  histograms, and dc2 is the error on this weight.  This is useful, for example,
//  when forming an asymmetry between two histograms from 2 different data sets that
//  need to be normalized to each other in some way.  The function calculates
//  the errors asumming Poisson statistics on h1 and h2 (that is, dh = sqrt(h)).
//
//  example:  assuming 'h1' and 'h2' are already filled
//
//     h3 = h1->GetAsymmetry(h2)
//
//  then 'h3' is created and filled with the asymmetry between 'h1' and 'h2';
//  h1 and h2 are left intact.
//
//  Note that it is the user's responsibility to manage the created histogram.


git-svn-id: http://root.cern.ch/svn/root/trunk@5818 27541ba8-7e3a-0410-8455-c3a389f83636
1 parent d8e0d65
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TAlien.h 
// @(#)root/alien:$Name:  $:$Id: TAlien.h,v 1.5 2002/05/30 13:28:57 rdm Exp $
// Author: Fons Rademakers   13/5/2002

/*************************************************************************
 * Copyright (C) 1995-2002, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TAlien
#define ROOT_TAlien


//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TAlien                                                               //
//                                                                      //
// Class defining interface to AliEn GRID services.                     //
//                                                                      //
// To open a connection to a AliEn GRID use the static method           //
// TGrid::Connect("alien://<host>", ..., ...).                          //
//                                                                      //
// Related classes are TAlienResult and TAlienAttrResult.               //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#ifndef ROOT_TGrid
#include "TGrid.h"
#endif

#if !defined(__CINT__)
#include <AliEn.h>
#else
typedef unsigned long Alien_t;
#endif


class TAlien : public TGrid {

private:
   Alien_t    fAlien;    // connection to AliEn server

   TString    MakeLfn(const char *lfn) const;

public:
   TAlien(const char *grid, const char *uid = 0, const char *pw = 0,
          const char *options = 0);
   ~TAlien();
   void         Close(Option_t *option="");

   //--- file catalog query
   TGridResult *Query(const char *wildcard);

   //--- file catalog management
   Int_t        AddFile(const char *lfn, const char *pfn, Int_t size);
   Int_t        DeleteFile(const char *lfn);
   Int_t        Mkdir(const char *dir, const char *options = 0);
   Int_t        Rmdir(const char *dir, const char *options = 0);
   char        *GetPhysicalFileName(const char *lfn);
   TGridResult *GetPhysicalFileNames(const char *lfn);
   Int_t        GetPathInfo(const char *lfn, Long_t *size,
                            Long_t *flags, Long_t *modtime);

   //--- file attribute management
   Int_t        AddAttribute(const char *lfn, const char *attrname,
                             const char *attrval);
   Int_t        DeleteAttribute(const char *lfn, const char *attrname);
   TGridResult *GetAttributes(const char *lfn);

   //--- catalog navigation & browsing
   const char  *Pwd() const;
   Int_t        Cd(const char *dir = 0) const;
   TGridResult *Ls(const char *dir = 0, const char *options = 0) const;
   void         Browse(TBrowser *b);

   //--- status and info
   const char  *GetInfo();

   ClassDef(TAlien,0)  // Interface to AliEn GRID services
};

#endif
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