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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkGaussianTransferFunction.txx,v $
Language: C++
Date: $Date: 2009-04-06 11:15:09 $
Version: $Revision: 1.2 $
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 __itkGaussianTransferFunction_txx
#define __itkGaussianTransferFunction_txx
#include "itkGaussianTransferFunction.h"
namespace itk
{
namespace Statistics
{
/** Constructor */
template<class ScalarType>
GaussianTransferFunction<ScalarType>
::GaussianTransferFunction()
{
}
/** Destructor */
template<class ScalarType>
GaussianTransferFunction<ScalarType>
::~GaussianTransferFunction()
{
}
/** Evaluate function */
template<class ScalarType>
ScalarType
GaussianTransferFunction<ScalarType>
::Evaluate(const ScalarType& input) const
{
return static_cast<ScalarType>((vcl_exp(-1 * input * input)));
}
/** Evaluate derivatives function */
template<class ScalarType>
ScalarType
GaussianTransferFunction<ScalarType>
::EvaluateDerivative(const ScalarType& input) const
{
return static_cast<ScalarType>(-2 * Evaluate(input) * input);
}
/** Print the object */
template<class ScalarType>
void
GaussianTransferFunction<ScalarType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
os << indent << "GaussianTransferFunction(" << this << ")" << std::endl;
Superclass::PrintSelf( os, indent );
}
} // end namespace Statistics
} // end namespace itk
#endif
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