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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkRegularStepGradientDescentOptimizer.cxx,v $
Language: C++
Date: $Date: 2007-03-22 14:29:14 $
Version: $Revision: 1.19 $
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 _itkRegularStepGradientDescentOptimizer_txx
#define _itkRegularStepGradientDescentOptimizer_txx
#include "itkRegularStepGradientDescentOptimizer.h"
#include "itkCommand.h"
#include "itkEventObject.h"
namespace itk
{
/**
* Advance one Step following the gradient direction
* This method will be overrided in non-vector spaces
*/
void
RegularStepGradientDescentOptimizer
::StepAlongGradient( double factor,
const DerivativeType & transformedGradient )
{
itkDebugMacro(<<"factor = " << factor << " transformedGradient= " << transformedGradient );
const unsigned int spaceDimension =
m_CostFunction->GetNumberOfParameters();
ParametersType newPosition( spaceDimension );
ParametersType currentPosition = this->GetCurrentPosition();
for(unsigned int j=0; j<spaceDimension; j++)
{
newPosition[j] = currentPosition[j] + transformedGradient[j] * factor;
}
itkDebugMacro(<<"new position = " << newPosition );
this->SetCurrentPosition( newPosition );
}
} // end namespace itk
#endif
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