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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkSymmetricEigenSystem.txx,v $
Language: C++
Date: $Date: 2007-03-22 21:39:38 $
Version: $Revision: 1.8 $
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 __itkSymmetricEigenSystem_txx
#define __itkSymmetricEigenSystem_txx
#include "itkSymmetricEigenSystem.h"
namespace itk
{
/**
* Constructor
*/
template< class TMatrixElement, int VNumberOfRows >
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::SymmetricEigenSystem()
{
m_Matrix = 0;
m_UseAbsoluteOrder = true;
m_EigenValues.Fill( NumericTraits< TMatrixElement >::Zero );
ArrayType temp;
temp.Fill( NumericTraits< TMatrixElement >::Zero );
m_EigenVectors.Fill(temp);
}
/**
* Destructor
*/
template< class TMatrixElement, int VNumberOfRows >
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::~SymmetricEigenSystem()
{
}
template< class TMatrixElement, int VNumberOfRows >
void
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Matrix:";
if ( m_Matrix != 0 )
{
os << m_Matrix << std::endl;
}
else
{
os << "not set." << std::endl;
}
os << indent << "Eigen Vectors " << m_EigenVectors << std::endl;
os << indent << "Eigen Values " << m_EigenValues << std::endl;
os << indent << "Absolute order " << m_UseAbsoluteOrder << std::endl;
}
/**
* Compute the eigen values and vectors
*/
template< class TMatrixElement, int VNumberOfRows >
void
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::GenerateData( void )
{
int i, j, k;
InternalEigenSystemType internalEigenSystem(m_Matrix->GetVnlMatrix());
typedef vnl_vector< TMatrixElement > EigenVectorType;
EigenVectorType tempVector;
for (i = 0; i < VNumberOfRows; i++)
{
tempVector = internalEigenSystem.get_eigenvector(i);
m_EigenValues[i] = internalEigenSystem.get_eigenvalue(i);
for (j = 0; j < VNumberOfRows; j++)
{
m_EigenVectors[i][j] = tempVector[j];
}
}
double temp;
for(i = 0; i < (VNumberOfRows - 1); i++)
{
for(j = i + 1; j < VNumberOfRows; j++)
{
if( (m_EigenValues[j] > m_EigenValues[i] && !m_UseAbsoluteOrder) ||
( (vnl_math_abs( m_EigenValues[j] ) > vnl_math_abs( m_EigenValues[i] ) )
&& m_UseAbsoluteOrder) )
{
temp= m_EigenValues[i];
m_EigenValues[i] = m_EigenValues[j];
m_EigenValues[j] = temp;
for ( k = 0; k < VNumberOfRows; k++ )
{
temp = m_EigenVectors[i][k];
m_EigenVectors[i][k] = m_EigenVectors[j][k];
m_EigenVectors[j][k] = temp;
}
}
}
}
}
} // end namespace itk
#endif
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