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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkMeanSquaredErrorFunction.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkMeanSquaredErrorFunction_txx
#define __itkMeanSquaredErrorFunction_txx
#include "itkMeanSquaredErrorFunction.h"
namespace itk
{
namespace Statistics
{
/** Constructor */
template<class TMeasurementVector, class ScalarType>
MeanSquaredErrorFunction<TMeasurementVector,ScalarType>
::MeanSquaredErrorFunction()
{
}
/** Destructor */
template<class TMeasurementVector, class ScalarType>
MeanSquaredErrorFunction <TMeasurementVector,ScalarType>
::~MeanSquaredErrorFunction()
{
}
/** Evaluate */
template<class TMeasurementVector, class ScalarType>
ScalarType
MeanSquaredErrorFunction <TMeasurementVector,ScalarType>
::Evaluate(const TMeasurementVector& errors) const
{
vnl_vector <ScalarType> temp(errors.Size());
for(unsigned int i=0; i<errors.Size(); i++)
{
temp[i]=errors[i];
}
return (temp.squared_magnitude() / temp.size());
}
/** Evaluate derivatives */
template<class TMeasurementVector, class ScalarType>
typename MeanSquaredErrorFunction <TMeasurementVector,ScalarType>
::InternalVectorType
MeanSquaredErrorFunction <TMeasurementVector,ScalarType>
::EvaluateDerivative(const TMeasurementVector& errors) const
{
ScalarType m = static_cast<ScalarType>(2) / errors.Size();
InternalVectorType temp(errors.Size());
for(unsigned int i=0; i<errors.Size(); i++)
{
temp[i]=errors[i]*m;
}
return temp;
}
/** Print the object */
template<class TMeasurementVector, class ScalarType>
void
MeanSquaredErrorFunction <TMeasurementVector,ScalarType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
os << indent << "MeanSquaredErrorFunction(" << this << ")" << std::endl;
Superclass::PrintSelf( os, indent );
}
} // end namespace Statistics
} // end namespace itk
#endif
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