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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2010 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 2553 $
//
// $LastChangedDate: 2010-11-06 15:14:57 -0700 (Sat, 06 Nov 2010) $
//
// $LastChangedBy: torsten_at_home $
//
*/
namespace
cmtk
{
/** \addtogroup Base */
//@{
template<class T> size_t
TemplateArray<T>::GetStatistics
( Types::DataItem& mean, Types::DataItem& variance ) const
{
size_t Count = 0;
Types::DataItem Sum = 0, SumOfSquares = 0;
for ( size_t i = 0; i < DataSize; ++i )
{
if ( !this->PaddingFlag || (this->Data[i] != this->Padding) )
{
++Count;
Sum += this->Data[i];
SumOfSquares += MathUtil::Square<Types::DataItem>( this->Data[i] );
}
}
if ( Count )
{
mean = Sum / Count;
variance = (SumOfSquares - 2*mean*Sum)/Count + MathUtil::Square(mean);
}
else
{
variance = mean = 0;
}
return Count;
}
template<class T>
Histogram<unsigned int>::SmartPtr
TemplateArray<T>::GetHistogram( const unsigned int numberOfBins, const bool centeredBins ) const
{
Histogram<unsigned int>::SmartPtr histogram( new Histogram<unsigned int>( numberOfBins ) );
if ( centeredBins )
histogram->SetRangeCentered( Types::DataItemRange( this->GetRangeTemplate() ) );
else
histogram->SetRange( Types::DataItemRange( this->GetRangeTemplate() ) );
for ( size_t idx = 0; idx < DataSize; ++idx )
if ( !this->PaddingFlag || (this->Data[idx] != this->Padding) )
histogram->Increment( histogram->ValueToBin( this->Data[idx] ) );
return histogram;
}
} // namespace cmtk
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