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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkTanSigmoidTransferFunction.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 __itkTanSigmoidTransferFunction_txx
#define __itkTanSigmoidTransferFunction_txx
namespace itk
{
namespace Statistics
{
/** Constructor */
template<class ScalarType>
TanSigmoidTransferFunction<ScalarType>
::TanSigmoidTransferFunction()
{
}
/** Destructor */
template<class ScalarType>
TanSigmoidTransferFunction<ScalarType>
::~TanSigmoidTransferFunction()
{
}
/** Evaluate */
template<class ScalarType>
ScalarType
TanSigmoidTransferFunction<ScalarType>
::Evaluate(const ScalarType& input) const
{
return static_cast<ScalarType>((2
/ (1 + vcl_exp(-2 * static_cast<ScalarType>(input))))
- 1);
}
/** Evaluate derivatives */
template<class ScalarType>
ScalarType
TanSigmoidTransferFunction<ScalarType>
::EvaluateDerivative(const ScalarType& input) const
{
ScalarType f = Evaluate(input);
return 1 - (f * f);
}
/** Print the object */
template<class ScalarType>
void
TanSigmoidTransferFunction<ScalarType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
os << indent << "TanSigmoidTransferFunction(" << this << ")" << std::endl;
Superclass::PrintSelf( os, indent );
}
} // end namespace Statistics
} // end namespace itk
#endif
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