/usr/include/InsightToolkit/Numerics/itkSymmetricEigenSystem.txx is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | /*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkSymmetricEigenSystem.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 __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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