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/*
* Copyright (C) 2002,2003 by Jonathan Naylor G4KLX
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Correlation.h"
#include "Exception.h"
#include <cmath>
using namespace std;
CCorrelation::CCorrelation() :
m_product(0.0),
m_divisorA(0.0),
m_divisorB(0.0),
m_count(0)
{
}
CCorrelation::~CCorrelation()
{
}
void CCorrelation::clear()
{
m_product = 0.0;
m_divisorA = 0.0;
m_divisorB = 0.0;
m_count = 0;
}
void CCorrelation::addProduct(double a, double b)
{
m_product += a * b;
m_divisorA += a * a;
m_divisorB += b * b;
m_count++;
}
bool CCorrelation::getRawValue(double& value) const
{
value = m_product;
return (m_product > 0.0);
}
bool CCorrelation::getNormalisedValue(double& value) const
{
if (m_product <= 0.0) {
value = m_product;
return false;
}
double square = ::sqrt(m_divisorA * m_divisorB);
if (m_count == 0 || square == 0.0)
throw CException(wxT("Divide by zero in Correlator"));
value = m_product / square;
return true;
}
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