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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkMeanCalculator.txx,v $
Language: C++
Date: $Date: 2009-03-04 15:23:58 $
Version: $Revision: 1.17 $
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 __itkMeanCalculator_txx
#define __itkMeanCalculator_txx
namespace itk {
namespace Statistics {
template< class TSample >
MeanCalculator< TSample >
::MeanCalculator()
{
m_Output.Fill(0.0);
}
template< class TSample >
void
MeanCalculator< TSample >
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Output: " << m_Output << std::endl;
}
template< class TSample >
typename MeanCalculator< TSample >::OutputType*
MeanCalculator< TSample >
::GetOutput()
{
return &m_Output;
}
template< class TSample >
void
MeanCalculator< TSample >
::GenerateData()
{
typename TSample::ConstIterator iter = this->GetInputSample()->Begin();
typename TSample::ConstIterator end = this->GetInputSample()->End();
double totalFrequency = 0.0;
this->SetMeasurementVectorSize(
this->GetInputSample()->GetMeasurementVectorSize());
const MeasurementVectorSizeType measurementVectorSize
= this->GetMeasurementVectorSize();
MeasurementVectorTraits::SetLength( m_Output, measurementVectorSize );
if (measurementVectorSize == 0)
{
itkExceptionMacro( << "Length of a measurement vector cannot be zero.");
}
while (iter != end)
{
double frequency = iter.GetFrequency();
totalFrequency += frequency;
for (unsigned int dim = 0; dim < measurementVectorSize; dim++)
{
m_Output[dim] += iter.GetMeasurementVector()[dim] * frequency;
}
++iter;
}
m_Output /= totalFrequency;
}
} // end of namespace Statistics
} // end of namespace itk
#endif
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