/usr/include/ITK-4.5/itkGaussianRadialBasisFunction.hxx is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef __itkGaussianRadialBasisFunction_hxx
#define __itkGaussianRadialBasisFunction_hxx
#include "itkGaussianRadialBasisFunction.h"
#include <cmath>
namespace itk
{
namespace Statistics
{
/** Constructor */
template<typename ScalarType>
GaussianRadialBasisFunction< ScalarType>
::GaussianRadialBasisFunction()
{
}
/** Destructor */
template<typename ScalarType>
GaussianRadialBasisFunction< ScalarType>
::~GaussianRadialBasisFunction()
{
}
/** Evaluate function */
template<typename 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<typename 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<typename 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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