CalibrationSmearer.h

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// $Id: CalibrationSmearer.h,v 1.2 2004/07/21 16:36:05 tagg Exp $
// CalibrationSmearer
//
// Base class for an object that can provide hashable random number lookup
// to smear random number generation.
//
//
// Nathaniel Tagg n.tagg1@physics.ox.ac.uk

#ifndef CALIBRATIONSMEARER_H
#define CALIBRATIONSMEARER_H

// 
// CalibrationSmearer
//
// A class that serves to serve random numbers generated once from 
// a key. This can be used to change the calibration values around
// their means by random errors.
//
// To use: Make one. Store it somewhere for the length of the job run.
// To get values out, use GetGausSmear(key), where key is a channel ID 
// of some kind (like PlexStripEndId::GetEncoded())
//
// Nathaniel Tagg n.tagg1@physics.ox.ac.uk
//

#include <TRandom.h>

class CalibrationSmearer : public TObject
{
 public:
  CalibrationSmearer( Int_t size = 1001, TRandom* generator = 0 );
  ~CalibrationSmearer();
  
  // Return a single random normal number (-inf,inf) that is always the same for 
  // a single value of KEY:
  Float_t       GetGausSmear(Int_t key) const;

  // Return a set of n random normal numbers:
  const Float_t* GetGausSmears(Int_t key, Int_t n) const;

 private:
  Int_t     fN;
  Float_t* fValues;

  ClassDef(CalibrationSmearer,0);
};

#endif

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