C:/Users/Andreas Schiffler/Desktop/SVN/NewGamePhysics/NewGamePhysics/Mathematics/Gaussian.cs

//-----------------------------------------------------------------------------
// Gaussian.cs
// (A. Schiffler, 2009)
//-----------------------------------------------------------------------------

namespace NewGamePhysics.Mathematics
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    
    public static class Gaussian
    {
        private static double InverseRootTwoPi = 1.0 / Math.Sqrt(2.0 * Math.PI);

        public static double DistributionValue(double deviation, double x)
        {
            return DistributionValue(0.0, deviation, x);
        }

        public static double DistributionValue(double mean, double deviation, double x)
        {
            if (deviation <= 0.0)
            {
                throw new ArgumentException("deviation cannot be less or equals than zero", "deviation");
            }

            double scale = InverseRootTwoPi / deviation;
            double negativeInverseTwoSigmaSquared = -1.0 / (2.0* deviation * deviation);
            double shiftedInput = x - mean;
            double shiftedInputSquared = shiftedInput * shiftedInput;
            return scale * Math.Exp(negativeInverseTwoSigmaSquared * shiftedInputSquared);
        }
    }
}

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