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/*
Author: Scott Kuehn, Shane Neph
Date: Thu Sep 27 16:47:55 PDT 2007
*/
//
// BEDOPS
// Copyright (C) 2011-2022 Shane Neph, Scott Kuehn and Alex Reynolds
//
// This program 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 2 of the License, or
// (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#ifndef VARIANCEVISITOR_HPP
#define VARIANCEVISITOR_HPP
#include "data/measurement/NaN.hpp"
#include "data/measurement/SelectMeasureType.hpp"
namespace Visitors {
template <
typename Process,
typename BaseVisitor
>
struct Variance : BaseVisitor {
typedef BaseVisitor BaseClass;
typedef Process ProcessType;
typedef typename BaseClass::RefType RefType;
typedef typename BaseClass::MapType MapType;
typedef typename Signal::SelectMeasure<MapType>::MeasureType MT;
explicit Variance(const ProcessType& pt = ProcessType())
: pt_(pt), sum_(0), squareSum_(0), count_(0)
{ /* */ }
inline void Add(MapType* bt) {
sum_ += *bt;
squareSum_ += (*bt * *bt);
count_++;
}
inline void Delete(MapType* bt) {
sum_ -= *bt;
squareSum_ -= (*bt * *bt);
count_--;
}
inline void DoneReference() {
static const Signal::NaN nan = Signal::NaN();
if ( count_ <= 1 )
pt_.operator()(nan);
else {
MT numer = (count_ * squareSum_) - (sum_ * sum_);
MT denom = (count_ * (count_ - 1));
pt_.operator()(numer / denom);
}
}
virtual ~Variance() { /* */ }
protected:
ProcessType pt_;
MT sum_;
MT squareSum_;
long count_;
};
} // namespace Visitors
#endif // VARIANCEVISITOR_HPP
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