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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGaussianRadialBasisFunction.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 __itkGaussianRadialBasisFunction_txx
#define __itkGaussianRadialBasisFunction_txx
#include "itkGaussianRadialBasisFunction.h"
#include <math.h>
namespace itk
{
namespace Statistics
{
/** Constructor */
template<class ScalarType>
GaussianRadialBasisFunction< ScalarType>
::GaussianRadialBasisFunction()
{
}
/** Destructor */
template<class ScalarType>
GaussianRadialBasisFunction< ScalarType>
::~GaussianRadialBasisFunction()
{
}
/** Evaluate function */
template<class ScalarType>
ScalarType
GaussianRadialBasisFunction< ScalarType>
::Evaluate(const ScalarType& input) const
{
ScalarType val;
ScalarType radius = Superclass::GetRadius();
val = vcl_exp(-0.5*vcl_pow(input,2)/vcl_pow(radius,2));
return val;
}
/** Evaluate derivative function */
template<class ScalarType>
ScalarType
GaussianRadialBasisFunction< ScalarType>
::EvaluateDerivative(const ScalarType& dist,const ArrayType& input,
char mode,int element_id) const
{
ScalarType val = 0;
ScalarType radius=Superclass::GetRadius();
ArrayType center = Superclass::GetCenter();
if(mode=='u') //w.r.t centers
{
ScalarType temp1= vcl_pow(radius,2);
val=Evaluate(dist)
*(input.GetElement(element_id)-center.GetElement(element_id))/temp1;
}
else if(mode=='s') // w.r.t radius
{
val=Evaluate(dist)*vcl_pow(dist,2)/vcl_pow(radius,3);
}
return val;
}
/** Print the object */
template<class ScalarType>
void
GaussianRadialBasisFunction<ScalarType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
os << indent << "GaussianRadialBasisFunction(" << this << ")" << std::endl;
Superclass::PrintSelf( os, indent );
}
} // end namespace Statistics
} // end namespace itk
#endif
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