MIFunctionContribution.cc

Go to the documentation of this file.

// This file is a part of MinuitInterface - a front end for the Minuit minimization
//       package (Minuit itself was authored by Fred James, of CERN)
// 
// 
// Copyright Cornell University 1993, 1996, All Rights Reserved.
// 
// This software written by Lawrence Gibbons, Cornell University.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice and author attribution, this list of conditions and the
//    following disclaimer. 
// 2. Redistributions in binary form must reproduce the above copyright
//    notice and author attribution, this list of conditions and the
//    following disclaimer in the documentation and/or other materials
//    provided with the distribution.
// 3. Neither the name of the University nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
// 
// Creation of derivative forms of this software for commercial
// utilization may be subject to restriction; written permission may be
// obtained from Cornell University.
// 
// CORNELL MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.  By way
// of example, but not limitation, CORNELL MAKES NO REPRESENTATIONS OR
// WARRANTIES OF MERCANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT
// THE USE OF THIS SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY PATENTS,
// COPYRIGHTS, TRADEMARKS, OR OTHER RIGHTS.  Cornell University shall not be
// held liable for any liability with respect to any claim by the user or any
// other party arising from use of the program.
//

#include "MinuitInterface/MIFunctionContribution.h"
#include "MinuitInterface/MinuitMinimizationManager.h"

MIFunctionContribution::MIFunctionContribution( MinuitMinimizationManager* aManager ) :
   MIObserver(),
   m_manager( aManager ),
   m_functionEvaluated( false ),
   m_contribution( 0 ),
   m_contributing( true )
{
  if( m_manager != NULL ) m_manager->attach( this );
}

MIFunctionContribution::~MIFunctionContribution() {

  if( m_manager != NULL ) m_manager->detach( this );
}

void
MIFunctionContribution::update( const MISubject* callingSubject ) {
   m_contribution = operator()();
   m_functionEvaluated = true;
}

double
MIFunctionContribution::contribution() {
   if ( ! m_functionEvaluated ) {update(m_manager);}
   return m_contribution;
}

// default unkown derviative -- can be overriden by user
double
MIFunctionContribution::derivative( const MinuitParameter& par ){
    
    return kUnknownDerivative;
}


// this value is the same as fUndefi in the URMinuit class
// when derivatives cannot be computed it should be returned
const double MIFunctionContribution::kUnknownDerivative = -54321;