UserSimulation.ErrorGenerator.MultinomialSample C# (CSharp) Méthode

        public int MultinomialSample(double[] probabilities)
        {
            const double EPSILON = 0.01;

            // normalize probabilities
            var k = 1.0 / probabilities.Sum();
            var probs = probabilities.Select(pr => k * pr);

            if (probs.Sum() < 1 - EPSILON || probs.Sum() > 1 + EPSILON)
            {
                throw new Exception("Probabilities do not sum to 1.");
            }

            // draw intervals
            double[] intervals = probs.Select((pr_1, i) => probs.Where((pr_2, j) => j < i).Sum() + pr_1).ToArray();

            // draw a sample
            var s = r.NextDouble();

            // the inputchars at index idx is the char to mistype
            for (int i = 0; i < intervals.Length; i++)
            {
                if (s > intervals[i])
                {
                    continue;
                }
                else
                {
                    return i;
                }
            }

            throw new Exception("Cannot find appropriate bin.");
        }