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/**
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* Measurement
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* s8
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*
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* Created by Samvel Khalatian on Dec 20, 2010
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* Copyright 2010, All rights reserved
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*/
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#include <cmath>
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#include <ostream>
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#include <stdexcept>
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#include "s8/Stat/interface/Measurement.h"
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using std::runtime_error;
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using s8::Measurement;
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Measurement::Measurement() throw():
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_value(0),
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_variance(0)
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{
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}
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Measurement::Measurement(const double &value, const double &variance) throw():
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_value(value),
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_variance(variance)
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{
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}
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double Measurement::value() const
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{
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return _value;
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}
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double Measurement::variance() const
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{
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return _variance;
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}
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void Measurement::setValue(const double &value)
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{
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_value = value;
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}
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void Measurement::setVariance(const double &variance)
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{
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_variance = variance;
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}
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// Helpers
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//
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std::ostream &s8::operator<<(std::ostream &out, const Measurement &m)
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{
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using std::ios_base;
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using std::ios;
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const std::streamsize precision = out.precision(4);
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const ios_base::fmtflags flags = out.flags(ios::fixed);
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const double sigma = sqrt(m.variance());
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out << m.value() << " +/- " << sigma;
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out.precision(2);
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out << " (" << 100 * sigma / m.value() << "%)";
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out.flags(flags);
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out.precision(precision);
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return out;
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}
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// Simple logic
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//
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Measurement s8::operator +(const Measurement &m1, const Measurement &m2)
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{
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Measurement m = m1;
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m += m2;
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return m;
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}
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Measurement s8::operator -(const Measurement &m1, const Measurement &m2)
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{
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Measurement m = m1;
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m -= m2;
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return m;
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}
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Measurement s8::operator *(const Measurement &m1, const Measurement &m2)
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{
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Measurement m = m1;
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m *= m2;
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return m;
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}
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Measurement s8::operator /(const Measurement &m1, const Measurement &m2)
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{
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Measurement m = m1;
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m /= m2;
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return m;
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}
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Measurement s8::operator %(const Measurement &m1, const Measurement &m2)
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{
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Measurement m = m1;
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m %= m2;
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return m;
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}
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// Shortcuts: no temporary variable is created
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//
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void s8::operator+=(Measurement &m1, const Measurement &m2)
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{
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m1.setValue(m1.value() + m2.value());
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m1.setVariance(m1.variance() + m2.variance());
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}
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void s8::operator-=(Measurement &m1, const Measurement &m2)
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{
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m1.setValue(m1.value() - m2.value());
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m1.setVariance(m1.variance() + m2.variance());
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}
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void s8::operator*=(Measurement &m1, const Measurement &m2)
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{
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m1.setValue(m1.value() * m2.value());
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m1.setVariance(pow(m2.value(), 2) * m1.variance() +
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pow(m1.value(), 2) * m2.variance());
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}
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void s8::operator/=(Measurement &m1, const Measurement &m2)
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{
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if (0 == m2.value())
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throw runtime_error("Failed to divide by null Measurement");
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m1.setValue(m1.value() / m2.value());
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m1.setVariance(pow(1. / m2.value(), 2) * m1.variance() +
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pow(m1.value() / pow(m2.value(), 2), 2) *
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m2.variance());
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}
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void s8::operator%=(Measurement &m1, const Measurement &m2)
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{
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if (0 == m2.value())
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throw runtime_error("Failed to divide by null Measurement");
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const double ratio = m1.value() / m2.value();
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m1.setValue(ratio);
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m1.setVariance(((1 - 2 * ratio) * m1.variance() +
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pow(ratio, 2) * m2.variance()) / pow(m2.value(), 2));
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}
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