public static double LogAverageFactor(double max, double a, double b)
{
return((max == Factor.Max(a, b)) ? 0.0 : Double.NegativeInfinity);
}
public static double LogAverageFactor(bool isPositive, double x)
{
return((isPositive == Factor.IsPositive(x)) ? 0.0 : Double.NegativeInfinity);
}
/// <summary>
/// Evidence message for EP
/// </summary>
/// <param name="sum">Incoming message from 'Sum'.</param>
/// <param name="a">Constant value for 'A'.</param>
/// <param name="b">Constant value for 'B'.</param>
/// <returns>Logarithm of the factor's average value across the given argument distributions</returns>
/// <remarks><para>
/// The formula for the result is <c>log(sum_(Sum) p(Sum) factor(Sum,A,B))</c>.
/// </para></remarks>
public static double LogAverageFactor(Discrete sum, int a, int b)
{
return(sum.GetLogProb(Factor.Plus(a, b)));
}