RooUnblindOffset.cxx

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitModels                                                     *
 * @(#)root/roofit:$Id$
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/

/**
\file RooUnblindOffset.cxx
\class RooUnblindOffset
\ingroup Roofit

Implementation of BlindTools' offset blinding method
A RooUnblindOffset object is a real valued function
object, constructed from a blind value holder and a 
set of unblinding parameters. When supplied to a PDF
in lieu of a regular parameter, the blind value holder
supplied to the unblinder objects will in a fit be minimized 
to blind value corresponding to the actual minimum of the
parameter. The transformation is chosen such that the
the error on the blind parameters is indentical to that
of the unblind parameter
**/

#include "RooFit.h"

#include "RooArgSet.h"
#include "RooArgSet.h"
#include "RooUnblindOffset.h"


using namespace std;

ClassImp(RooUnblindOffset)
;



////////////////////////////////////////////////////////////////////////////////
/// Default constructor

RooUnblindOffset::RooUnblindOffset() 
{
}



////////////////////////////////////////////////////////////////////////////////
/// Constructor from a given RooAbsReal (to hold the blind value) and a set of blinding parameters

RooUnblindOffset::RooUnblindOffset(const char *name, const char *title,
                const char *blindString, Double_t scale, RooAbsReal& cpasym)
  : RooAbsHiddenReal(name,title), 
  _value("value","Offset blinded value",this,cpasym),
  _blindEngine(blindString,RooBlindTools::full,0.,scale) 
{  
}


////////////////////////////////////////////////////////////////////////////////
/// Constructor from a given RooAbsReal (to hold the blind value) and a set of blinding parameters

RooUnblindOffset::RooUnblindOffset(const char *name, const char *title,
               const char *blindString, Double_t scale, RooAbsReal& cpasym,
               RooAbsCategory& blindState)
  : RooAbsHiddenReal(name,title,blindState),
    _value("value","Offset blinded value",this,cpasym), 
    _blindEngine(blindString,RooBlindTools::full,0.,scale)
{  
}



////////////////////////////////////////////////////////////////////////////////
/// Copy constructor

RooUnblindOffset::RooUnblindOffset(const RooUnblindOffset& other, const char* name) : 
  RooAbsHiddenReal(other, name), 
  _value("asym",this,other._value),
  _blindEngine(other._blindEngine) 
{
}



////////////////////////////////////////////////////////////////////////////////
/// Destructor

RooUnblindOffset::~RooUnblindOffset() 
{
}



////////////////////////////////////////////////////////////////////////////////
/// Evaluate RooBlindTools unhide-offset method on blind value

Double_t RooUnblindOffset::evaluate() const
{
  if (isHidden()) {
    // Blinding is active for this event
    return _blindEngine.UnHideOffset(_value);
  } else {
    // Blinding is not active for this event
    return _value ;
  }
}