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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 itkSymmetricEigenSystem_hxx
#define itkSymmetricEigenSystem_hxx
#include "itkSymmetricEigenSystem.h"
namespace itk
{
/**
* Constructor
*/
template< typename TMatrixElement, int VNumberOfRows >
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::SymmetricEigenSystem()
{
m_Matrix = ITK_NULLPTR;
m_UseAbsoluteOrder = true;
m_EigenValues.Fill(NumericTraits< TMatrixElement >::ZeroValue());
ArrayType temp;
temp.Fill(NumericTraits< TMatrixElement >::ZeroValue());
m_EigenVectors.Fill(temp);
}
/**
* Destructor
*/
template< typename TMatrixElement, int VNumberOfRows >
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::~SymmetricEigenSystem()
{}
template< typename TMatrixElement, int VNumberOfRows >
void
SymmetricEigenSystem< TMatrixElement, VNumberOfRows >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Matrix:";
if ( m_Matrix != ITK_NULLPTR )
{
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< typename 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 )
|| ( ( itk::Math::abs(m_EigenValues[j]) > itk::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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