source: proiecte/ParallelANN/BCMToolbox/Statistics/BasicStats.cs @ 171

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace BCMToolbox.Statistics
{
    [Serializable]
    public class BasicStats
    {
        public readonly double AverageWeight = 0.0;
        public readonly double AveragePotential = 0.0;

        public readonly double MinWeight = double.MaxValue;
        public readonly double MaxWeight = double.MinValue;
        public readonly double Weight2Norm = 0.0;

        public readonly double StddevWeight = 0.0;
        public readonly double StddevPotential = 0.0;


        public BasicStats(INetwork net)
        {
            int validWeights = 0;
            for (int i = 0; i < net.Count; i++)
            {
                AveragePotential += net[i];
                for (int j = 0; j < net.Count; j++)
                    if (!double.IsNaN(net[i, j]))
                    {
                        AverageWeight += net[i, j];
                        Weight2Norm += net[i, j] * net[i, j];
                        if (net[i, j] < MinWeight)
                            MinWeight = net[i, j];
                        if (net[i, j] > MaxWeight)
                            MaxWeight = net[i, j];
                        validWeights++;
                    }
            }

            AveragePotential /= net.Count;
            AverageWeight /= validWeights;

            for (int i = 0; i < net.Count; i++)
            {
                double p = net[i] - AveragePotential;
                p *= p;
                StddevPotential += p;

                for (int j = 0; j < net.Count; j++)
                    if(!double.IsNaN(net[i,j]))
                    {
                        p = net[i, j] - AverageWeight;
                        p *= p;
                        StddevWeight += p;
                    }
            }

            Weight2Norm = Math.Sqrt(Weight2Norm);

            StddevPotential = Math.Sqrt(StddevPotential);
            StddevPotential /= net.Count;

            StddevWeight = Math.Sqrt(StddevWeight);
            StddevWeight /= validWeights;
        }

        public override string ToString()
        {
            return String.Format("ave wt: {0} | stddev wt: {2} | wt range: {4} | wt norm2: {5} | ave out: {1} | stddev out: {3}",
                AverageWeight.ToString("#0.0000"),
                AveragePotential.ToString("#0.0000"),
                StddevWeight.ToString("#0.0000"),
                StddevPotential.ToString("#0.0000"),
                (MaxWeight - MinWeight).ToString("#0.0000"),
                Weight2Norm.ToString("#0.0000"));
        }
    }
}