AIMA.Core.Learning.Neural.LogSigActivationFunction.deriv C# (CSharp) Method

        public double deriv(double parameter)
        {
            // parameter = induced field
            // e == activation
            double e = 1.0 / (1.0 + Math.Pow(Math.E, (-1.0 * parameter)));
            return e * (1.0 - e);
        }
    }