/// <summary>
/// Clone this StatCounter
/// </summary>
/// <returns></returns>
internal StatCounter copy()
{
var other = new StatCounter();
other.n = n;
other.mu = mu;
other.m2 = m2;
other.maxValue = maxValue;
other.minValue = minValue;
return(other);
}
/// <summary>
/// Merge another StatCounter into this one, adding up the internal statistics.
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
internal StatCounter Merge(StatCounter other)
{
if (other == this)
{
return Merge(other.copy()); // Avoid overwriting fields in a weird order
}
else
{
if (n == 0)
{
mu = other.mu;
m2 = other.m2;
n = other.n;
maxValue = other.maxValue;
minValue = other.minValue;
}
else if (other.n != 0)
{
var delta = other.mu - mu;
if (other.n * 10 < n)
{
mu = mu + (delta * other.n) / (n + other.n);
}
else if (n * 10 < other.n)
{
mu = other.mu - (delta * n) / (n + other.n);
}
else
{
mu = (mu * n + other.mu * other.n) / (n + other.n);
}
m2 += other.m2 + (delta * delta * n * other.n) / (n + other.n);
n += other.n;
maxValue = Math.Max(maxValue, other.maxValue);
minValue = Math.Min(minValue, other.minValue);
}
return this;
}
}
/// <summary>
/// Merge another StatCounter into this one, adding up the internal statistics.
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
internal StatCounter Merge(StatCounter other)
{
if (other == this)
{
return(Merge(other.copy())); // Avoid overwriting fields in a weird order
}
else
{
if (n == 0)
{
mu = other.mu;
m2 = other.m2;
n = other.n;
maxValue = other.maxValue;
minValue = other.minValue;
}
else if (other.n != 0)
{
var delta = other.mu - mu;
if (other.n * 10 < n)
{
mu = mu + (delta * other.n) / (n + other.n);
}
else if (n * 10 < other.n)
{
mu = other.mu - (delta * n) / (n + other.n);
}
else
{
mu = (mu * n + other.mu * other.n) / (n + other.n);
}
m2 += other.m2 + (delta * delta * n * other.n) / (n + other.n);
n += other.n;
maxValue = Math.Max(maxValue, other.maxValue);
minValue = Math.Min(minValue, other.minValue);
}
return(this);
}
}
/// <summary>
/// Clone this StatCounter
/// </summary>
/// <returns></returns>
internal StatCounter copy()
{
var other = new StatCounter();
other.n = n;
other.mu = mu;
other.m2 = m2;
other.maxValue = maxValue;
other.minValue = minValue;
return other;
}
