/// <summary>
/// The integral of the product between this discrete and that discrete. This
/// is the probability that samples from this instance and that instance are equal
/// </summary>
/// <param name="that">That discrete distribution</param>
/// <returns>The inner product</returns>
public double ProbEqual(Discrete that)
{
if (IsPointMass)
{
return(that.Evaluate(Point));
}
else if (that.IsPointMass)
{
return(Evaluate(that.Point));
}
else
{
return(prob.Inner(that.prob));
}
}