/usr/include/ITK-4.9/itkSinRegularizedHeavisideStepFunction.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
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 itkSinRegularizedHeavisideStepFunction_hxx
#define itkSinRegularizedHeavisideStepFunction_hxx
#include "itkSinRegularizedHeavisideStepFunction.h"
#include "vnl/vnl_math.h"
namespace itk
{
template< typename TInput, typename TOutput >
SinRegularizedHeavisideStepFunction< TInput, TOutput >
::SinRegularizedHeavisideStepFunction() : Superclass()
{}
template< typename TInput, typename TOutput >
SinRegularizedHeavisideStepFunction< TInput, TOutput >
::~SinRegularizedHeavisideStepFunction()
{}
template< typename TInput, typename TOutput >
typename SinRegularizedHeavisideStepFunction< TInput, TOutput >::OutputType
SinRegularizedHeavisideStepFunction< TInput, TOutput >
::Evaluate( const InputType& input ) const
{
if ( static_cast< RealType >( input ) >= this->GetEpsilon() )
{
return NumericTraits< OutputType >::OneValue();
}
else
{
if ( static_cast< RealType >( input ) <= -this->GetEpsilon() )
{
return NumericTraits< OutputType >::ZeroValue();
}
else
{
const RealType angleFactor = 0.5 * vnl_math::pi * this->GetOneOverEpsilon();
const RealType angle = input * angleFactor;
return static_cast< OutputType >( 0.5 * ( 1.0 + std::sin( angle ) ) );
}
}
}
template< typename TInput, typename TOutput >
typename SinRegularizedHeavisideStepFunction< TInput, TOutput >::OutputType
SinRegularizedHeavisideStepFunction< TInput, TOutput >
::EvaluateDerivative(const InputType & input) const
{
if ( vnl_math_abs( static_cast< RealType >( input ) ) >= this->GetEpsilon() )
{
return NumericTraits< OutputType >::ZeroValue();
}
else
{
const RealType angleFactor = 0.5 * vnl_math::pi * this->GetOneOverEpsilon();
const RealType angle = input * angleFactor;
return static_cast< OutputType >( 0.5 * angleFactor * std::cos(angle) );
}
}
}
#endif
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