public void Add(double x)
{
int size = data.Span;
if (size < Span)
{
double mean = Mean + (x - Mean) / (size + 1);
double variance = 0.0;
if (size != 0)
{
variance = size * Variance;
variance += (x - Mean) * (x - mean);
variance /= (size + 1);
}
_mean = mean;
_variance = variance;
}
else
{
//Var[b] = [ (n-1)*Var[A] + n*Abar^2 + (x6^2 - x1^2) - n*Bbar^2 ] / (n-1)
double mean = Mean + (x - data[0]) / Span;
_variance = (Span * Variance + Span * (Mean * Mean - mean * mean) + x * x - data[0] * data[0]) / Span;
_mean = mean;
}
data.Add(x);
}
public void FillArray()
{
var array = new ShiftingArray <int>(5);
var list = new int[] {
1, 2, 3, 4, 5, 6, 7, 8, 9
};
for (int i = 0; i < 5; i++)
{
array.Add(list[i]);
Assert.That(array.Span, Is.EqualTo(i + 1));
Assert.That(array[i], Is.EqualTo(list[i]));
}
for (int i = 5; i < list.Length; i++)
{
array.Add(list[i]);
Assert.That(array.Span, Is.EqualTo(5));
Assert.That(array[0], Is.EqualTo(list[i - 4]));
Assert.That(array[4], Is.EqualTo(list[i]));
}
}
public double Add(double x)
{
int size = data.Span;
if (size < Span)
{
_average = (size * _average + x) / (size + 1);
}
else
{
_average += (x - data[0]) / Span;
}
data.Add(x);
return(_average);
}