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//
// class to hold a double value with asymmetric errors
//
#include "Utils/ErrValue.hh"
#include <math.h>
#define sqr(x) (x*x)
ErrValue::ErrValue():
meanValue(0.0),
plus(0.0),
minus(0.0)
{}
ErrValue::ErrValue(double value, double errPlus, double errMinus):
meanValue(value),
plus(errPlus),
minus(errMinus)
{}
ErrValue::~ErrValue()
{}
double ErrValue::mean() const
{
return meanValue;
}
double ErrValue::plusErr() const
{
return plus;
}
double ErrValue::minusErr() const
{
return minus;
}
void ErrValue::mean(double v)
{
meanValue = v;
return;
}
void ErrValue::plusErr(double v)
{
plus = v;
return;
}
void ErrValue::minusErr(double v)
{
minus = v;
return;
}
ErrValue ErrValue::operator+(ErrValue& v) const
{
ErrValue result(meanValue+v.mean(),
sqrt(plus*plus + v.plusErr()*v.plusErr()),
sqrt(minus*minus + v.minusErr()*v.minusErr()));
return result;
}
ErrValue ErrValue::operator-(ErrValue& v) const
{
ErrValue result(meanValue-v.mean(),
sqrt(plus*plus - v.plusErr()*v.plusErr()),
sqrt(minus*minus - v.minusErr()*v.minusErr()));
return result;
}
ErrValue ErrValue::operator*(ErrValue& v) const
{
ErrValue result(meanValue*v.mean(),
sqrt(sqr(v.mean()*plus) + sqr(meanValue*v.plusErr())),
sqrt(sqr(v.mean()*minus) + sqr(meanValue*v.minusErr())));
return result;
}
ErrValue ErrValue::operator/(ErrValue& v) const
{
ErrValue result(meanValue/v.mean(),
sqrt(sqr(v.mean()*plus) + sqr(meanValue*v.plusErr())),
sqrt(sqr(v.mean()*minus) + sqr(meanValue*v.minusErr())));
return result;
}
ErrValue& ErrValue::operator=(ErrValue& v)
{
if ( this == &v ) return *this;
meanValue = v.mean();
plus = v.plusErr();
minus = v.minusErr();
return *this;
}
ErrValue& ErrValue::operator+=(ErrValue& v)
{
meanValue += v.mean();
plus = sqrt(plus*plus + v.plusErr()*v.plusErr());
minus = sqrt(minus*minus + v.minusErr()*v.minusErr());
return *this;
}
ErrValue& ErrValue::operator-=(ErrValue& v)
{
meanValue -= v.mean();
plus = sqrt(plus*plus + v.plusErr()*v.plusErr());
minus = sqrt(minus*minus + v.minusErr()*v.minusErr());
return *this;
}
ErrValue& ErrValue::operator*=(ErrValue& v)
{
meanValue *= v.mean();
plus = sqrt(sqr(v.mean()*plus) + sqr(meanValue*v.plusErr()));
minus = sqrt(sqr(v.mean()*minus) + sqr(meanValue*v.minusErr()));
return *this;
}
ErrValue& ErrValue::operator/=(ErrValue& v)
{
meanValue /= v.mean();
plus = sqrt(sqr(v.mean()*plus) + sqr(meanValue*v.plusErr()));
minus = sqrt(sqr(v.mean()*minus) + sqr(meanValue*v.minusErr()));
return *this;
}
bool ErrValue::operator<(ErrValue& v) const
{
return (meanValue < v.mean());
}
bool ErrValue::operator<=(ErrValue& v) const
{
return (meanValue <= v.mean());
}
bool ErrValue::operator>(ErrValue& v) const
{
return (meanValue > v.mean());
}
bool ErrValue::operator>=(ErrValue& v) const
{
return (meanValue >= v.mean());
}
std::ostream &operator<<(std::ostream &o, const ErrValue &v)
{
o << v.mean() << "+" << v.plusErr() << "-" << v.minusErr();
return o;
}