C# MersenneTwister类代码示例

	// Code that runs on entering the state.
	public override void OnEnter()
	{
		MersenneTwister random = new MersenneTwister();
		storeResult.Value = random.Next(max.Value);
		
		Finish();
	}

 public static MersenneTwister Create()
 {
     var random = new Random();
     var seed = (uint) (random.Next(int.MaxValue) + (uint) random.Next(int.MaxValue));
     var twiseter = new MersenneTwister(seed);
     return twiseter;
 }

      public GbmState(IRegressionProblemData problemData, ILossFunction lossFunction, uint randSeed, int maxSize, double r, double m, double nu) {
        // default settings for MaxSize, Nu and R
        this.maxSize = maxSize;
        this.nu = nu;
        this.r = r;
        this.m = m;

        this.randSeed = randSeed;
        random = new MersenneTwister(randSeed);
        this.problemData = problemData;
        this.trainingRows = problemData.TrainingIndices.ToArray();
        this.testRows = problemData.TestIndices.ToArray();
        this.lossFunction = lossFunction;

        int nRows = trainingRows.Length;

        y = problemData.Dataset.GetDoubleValues(problemData.TargetVariable, trainingRows).ToArray();

        treeBuilder = new RegressionTreeBuilder(problemData, random);

        activeIdx = Enumerable.Range(0, nRows).ToArray();

        var zeros = Enumerable.Repeat(0.0, nRows).ToArray();
        double f0 = lossFunction.LineSearch(y, zeros, activeIdx, 0, nRows - 1); // initial constant value (mean for squared errors)
        pred = Enumerable.Repeat(f0, nRows).ToArray();
        predTest = Enumerable.Repeat(f0, testRows.Length).ToArray();
        pseudoRes = new double[nRows];

        models = new List<IRegressionModel>();
        weights = new List<double>();
        // add constant model
        models.Add(new ConstantModel(f0, problemData.TargetVariable));
        weights.Add(1.0);
      }

 public void ArgumentCreaterDistributionsTest() {
   var trees = new List<ISymbolicExpressionTree>();
   var grammar = Grammars.CreateArithmeticAndAdfGrammar();
   var random = new MersenneTwister(31415);
   int failedOps = 0;
   for (int i = 0; i < POPULATION_SIZE; i++) {
     ISymbolicExpressionTree tree;
     do {
       tree = ProbabilisticTreeCreator.Create(random, grammar, MAX_TREE_LENGTH, MAX_TREE_DEPTH);
       SubroutineCreater.CreateSubroutine(random, tree, MAX_TREE_LENGTH, MAX_TREE_DEPTH, 3, 3);
     } while (!TreeHasAdfWithParameter(tree, 3));
     var success = ArgumentCreater.CreateNewArgument(random, tree, 60000, 100, 3, 3);
     if (!success) failedOps++;
     Util.IsValid(tree);
     trees.Add(tree);
   }
   // difficult to make sure that create argument operations succeed because trees are macro-expanded can potentially become very big 
   // => just test if only a small proportion fails
   Assert.IsTrue(failedOps < POPULATION_SIZE * 0.05); // only 5% may fail
   Console.WriteLine("ArgumentCreator: " + Environment.NewLine +
     "Failed operations: " + failedOps * 100.0 / POPULATION_SIZE + " %" + Environment.NewLine +
     Util.GetSizeDistributionString(trees, 200, 20) + Environment.NewLine +
     Util.GetFunctionDistributionString(trees) + Environment.NewLine +
     Util.GetNumberOfSubtreesDistributionString(trees) + Environment.NewLine +
     Util.GetTerminalDistributionString(trees) + Environment.NewLine
     );
 }

 public TownGenerator(int MaxXSearchArea, int MaxZSearchArea)
 {
     this._towns = new List<Town> ();
     this._mt = new MersenneTwister ((uint)DateTime.Now.Ticks);
     this._maxXSearchArea = MaxXSearchArea;
     this._maxZSearchArea = MaxZSearchArea;
 }

    public void ProbabilisticTreeCreaterDistributionsTest() {
      var randomTrees = new List<ISymbolicExpressionTree>();
      var grammar = Grammars.CreateSimpleArithmeticGrammar();
      var random = new MersenneTwister(31415);
      var stopwatch = new Stopwatch();
      stopwatch.Start();
      for (int i = 0; i < POPULATION_SIZE; i++) {
        randomTrees.Add(ProbabilisticTreeCreator.Create(random, grammar, MAX_TREE_LENGTH, MAX_TREE_DEPTH));
      }
      stopwatch.Stop();

      int count = 0;
      int depth = 0;
      foreach (var tree in randomTrees) {
        Util.IsValid(tree);
        count += tree.Length;
        depth += tree.Depth;
      }
      double msPerRandomTreeCreation = stopwatch.ElapsedMilliseconds / (double)POPULATION_SIZE;

      Console.WriteLine("ProbabilisticTreeCreator: " + Environment.NewLine +
        msPerRandomTreeCreation + " ms per random tree (~" + Math.Round(1000.0 / (msPerRandomTreeCreation)) + "random trees / s)" + Environment.NewLine +
        Util.GetSizeDistributionString(randomTrees, 105, 5) + Environment.NewLine +
        Util.GetFunctionDistributionString(randomTrees) + Environment.NewLine +
        Util.GetNumberOfSubtreesDistributionString(randomTrees) + Environment.NewLine +
        Util.GetTerminalDistributionString(randomTrees) + Environment.NewLine +
        "Average tree depth: " + depth / POPULATION_SIZE + Environment.NewLine +
        "Average tree length: " + count / POPULATION_SIZE + Environment.NewLine +
        "Total nodes created: " + count + Environment.NewLine
        );
      //mkommend: commented due to performance issues on the builder
      // Assert.IsTrue(Math.Round(1000.0 / (msPerRandomTreeCreation)) > 250); // must achieve more than 250 random trees / s
    }

	// Use this for initialization
	void Start () {
		rand = new MersenneTwister ();
		spawnedMobs = new List<GameObject> ();

		// set local private player object to the singleton player.
		goPlayer = GameObject.FindWithTag ("Player").GetComponent<Player>();
	}

        public void RandomEnumerableProducesRangesWithUniformDistributions()
        {
            var randomSource = new MersenneTwister();
            const double trials = 100000;

            var zeroFrequency = Enumerable.Range(0, 10).ToDictionary(x => x, x => 0);

            var fiveFrequency = Enumerable.Range(0, 10).ToDictionary(x => x, x => 0);

            var nineFrequency = Enumerable.Range(0, 10).ToDictionary(x => x, x => 0);

            for (var count = 0; count < trials; count++ )
            {
                var result = Lospi.Utils.Statistics.RandomEnumerable.Range(0, 10, randomSource);

                zeroFrequency[result[0]]++;

                fiveFrequency[result[5]]++;

                nineFrequency[result[9]]++;
            }

            for (var i = 0; i < 10; i++)
            {
                Assert.That(zeroFrequency[i], Is.EqualTo(trials / 10D).Within(10).Percent);
                Assert.That(fiveFrequency[i], Is.EqualTo(trials / 10D).Within(10).Percent);
                Assert.That(nineFrequency[i], Is.EqualTo(trials / 10D).Within(10).Percent);
            }
        }

 public static void MyClassInitialize(TestContext testContext) {
   random = new MersenneTwister();
   symmetricDistances = new DoubleMatrix(ProblemSize, ProblemSize);
   symmetricWeights = new DoubleMatrix(ProblemSize, ProblemSize);
   asymmetricDistances = new DoubleMatrix(ProblemSize, ProblemSize);
   asymmetricWeights = new DoubleMatrix(ProblemSize, ProblemSize);
   nonZeroDiagonalDistances = new DoubleMatrix(ProblemSize, ProblemSize);
   nonZeroDiagonalWeights = new DoubleMatrix(ProblemSize, ProblemSize);
   for (int i = 0; i < ProblemSize - 1; i++) {
     for (int j = i + 1; j < ProblemSize; j++) {
       symmetricDistances[i, j] = random.Next(ProblemSize * 100);
       symmetricDistances[j, i] = symmetricDistances[i, j];
       symmetricWeights[i, j] = random.Next(ProblemSize * 100);
       symmetricWeights[j, i] = symmetricWeights[i, j];
       asymmetricDistances[i, j] = random.Next(ProblemSize * 100);
       asymmetricDistances[j, i] = random.Next(ProblemSize * 100);
       asymmetricWeights[i, j] = random.Next(ProblemSize * 100);
       asymmetricWeights[j, i] = random.Next(ProblemSize * 100);
       nonZeroDiagonalDistances[i, j] = random.Next(ProblemSize * 100);
       nonZeroDiagonalDistances[j, i] = random.Next(ProblemSize * 100);
       nonZeroDiagonalWeights[i, j] = random.Next(ProblemSize * 100);
       nonZeroDiagonalWeights[j, i] = random.Next(ProblemSize * 100);
     }
     nonZeroDiagonalDistances[i, i] = random.Next(ProblemSize * 100);
     nonZeroDiagonalWeights[i, i] = random.Next(ProblemSize * 100);
   }
   int index = random.Next(ProblemSize);
   if (nonZeroDiagonalDistances[index, index] == 0)
     nonZeroDiagonalDistances[index, index] = random.Next(1, ProblemSize * 100);
   index = random.Next(ProblemSize);
   if (nonZeroDiagonalWeights[index, index] == 0)
     nonZeroDiagonalWeights[index, index] = random.Next(1, ProblemSize * 100);
   assignment = new Permutation(PermutationTypes.Absolute, ProblemSize, random);
 }

        public static int DrunkardWalk(Unit unit)
        {
            MersenneTwister mt = new MersenneTwister();
            unit.MakeAMove((CardinalDirection)mt.Next(9));

            return 100;
        }

        public static string GenerateUrlCompatibleName(int length)
        {
            if (length < 0)
            {
                throw new ArgumentOutOfRangeException("The length parameter " + "cannot be below zero!");
            }
            var seed = (uint)(Guid.NewGuid().GetHashCode() + (uint)Int32.MaxValue);

            var result = new StringBuilder(length);
            var twister = new MersenneTwister(seed);

            for (int i = 0; i < length; ++i)
            {
                result.Append(
                    (char)twister.Next(Constants.BasicLatinStartSymbolNumber, Constants.BasicLatinEndSymbolNumber));
            }

            for (int i = Constants.BasicLatinExcludedStartSymbolNumber;
                 i <= Constants.BasicLatinExcludedEndSymbolNumber;
                 ++i)
            {
                result.Replace(
                    (char)i,
                    (char)
                    twister.Next(Constants.BasicLatinStartDigitSymbolNumber, Constants.BasicLatinEndDigitSymbolNumber));
            }
            return result.ToString();
        }

 public static string RandomString(string pattern, uint seed)
 {
     MersenneTwister oRandom = null;
     if (seed == 0) oRandom = new MersenneTwister();
     else oRandom = new MersenneTwister(seed);
     return RandomString(oRandom, pattern);
 }

        public static string GetIVs(uint seed, int initialFrame, int maxFrame)
        {
            string ivs = "";

            var rng = new MersenneTwister(seed);

            rng.Nextuint();
            rng.Nextuint();

            for (int n = 1; n < initialFrame; n++)
            {
                rng.Nextuint();
            }

            int rngCalls = maxFrame - initialFrame;

            for (int n = 0; n < rngCalls; n++)
            {
                uint result = rng.Nextuint();
                ivs += GetIV(result);

                if (n != rngCalls - 1)
                {
                    ivs += ", ";
                }
            }

            return ivs;
        }

        public Randomizer(string oldRomPath_, string fullSeed)
        {
            oldRomPath = oldRomPath_;
            newRomPath = "smb3rr_" + fullSeed + ".nes";

            SeparateFullSeed(fullSeed);             // prngSeed and levelFlags are initialized here
            mt = new MersenneTwister(prngSeed);
        }

 public void SampleKnownValues()
 {
     var mt = new MersenneTwister(0);
     Assert.AreEqual(mt.NextDouble(), 0.5488135024320365);
     Assert.AreEqual(mt.NextDouble(), 0.5928446165269344);
     Assert.AreEqual(mt.NextDouble(), 0.7151893651381110);
     Assert.AreEqual(mt.NextDouble(), 0.8442657442866512);
 }