private static Chromosome Roulette(Chromosome[] population)
{
double partsum = 0, sum = 0;
double worstFitness = double.MaxValue;
for (int i = 0; i < population.Length; i++)
{
sum += population[i].Fitness;
if (worstFitness > population[i].Fitness)
{
worstFitness = population[i].Fitness;
}
}
// fitness scaling -> F(x) = f(x) - worst
sum -= worstFitness * population.Length;
double r = ExtendedRandom.NextUniform() * sum;
for (int i = 0; i < population.Length; i++)
{
partsum += (population[i].Fitness - worstFitness);
if (partsum >= r)
{
return(population[i]);
}
}
return(null);
}
public void TestInt64()
{
var random = new ExtendedRandom();
var x = random.NextInt64();
var y = random.NextInt64();
Assert.AreNotEqual(x, y);
}
public void GenRandomString()
{
var length = 5;
var newString = ExtendedRandom.NextString(length);
Assert.Equal(length, newString.Length);
}
public void GenRandomStringMinMaxLength()
{
var min = 1;
var max = 10;
var newString = ExtendedRandom.NextString(min, max);
Assert.True(newString.Length >= min && newString.Length <= max);
}
private static Tuple <T, T, T> Randomize <T>()
{
var random = new ExtendedRandom();
var item1 = random.Randomize <T>();
var item2 = Random.Randomize <T>();
var item3 = Random.Randomize <T>();
return(new Tuple <T, T, T>(item1, item2, item3));
}
public void GenRandomDouble()
{
var min = 1.2;
var max = 2.5;
for (int i = 0; i < 20; i++)
{
var newDouble = ExtendedRandom.NextDouble(min, max);
Assert.True(newDouble >= min && newDouble <= max);
}
}
public Distribution(double mean, double variance)
{
Mean = mean;
Variance = variance;
if (Settings.FixSeed)
{
rnd = new ExtendedRandom(200844210);
}
else
{
rnd = new ExtendedRandom();
}
}
private static Chromosome Rank(Chromosome[] population, double alpha, double beta)
{
// assumes that the population has been previously sorted
// each chromosome has the rank computed in "ranks"
double partsum = 0;
double rankSum = population.Length * (population.Length + 1) / 2.0;
double r = ExtendedRandom.NextUniform() * rankSum;
for (int i = 0; i < population.Length; i++)
{
partsum += _ranks[i];
if (partsum > r)
{
return(population[i]);
}
}
return(null);
}
public void WeightedChoice_WithIntegerWeights_ReturnsCorrectWeighting()
{
var weights = new[] {2, 3, 5};
var items = new[] {"first", "second", "third"};
var totals = new[] {0, 0, 0};
for (var i = 0; i < 1000000; i++)
{
var item = Random.WeightedChoice(items, weights);
for (var j = 0; j < items.Length; j++)
{
if (items[j] == item)
{
totals[j]++;
}
}
}
// Statistically, this should never fail...
Assert.AreEqual(totals[0], 200000, 2000);
Assert.AreEqual(totals[1], 300000, 2000);
Assert.AreEqual(totals[2], 500000, 2000);
}
public void GenRandomDate()
{
var dateTime = ExtendedRandom.NextDateTime();
}
public Distribution(double mean, double variance)
{
Mean = mean;
Variance = variance;
rnd = new ExtendedRandom(Settings.SeedGenerator.Next());
}
public object Generate()
{
var obj = new TSource();
foreach (var prop in typeof(TSource).GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
if (Ignore.Contains(prop.Name))
{
continue;
}
if (Values.ContainsKey(prop.Name))
{
prop.SetValue(obj, Values[prop.Name], null);
continue;
}
if (Generators.ContainsKey(prop.Name))
{
try {
prop.SetValue(obj, Generators[prop.Name].Generate(), null);
} catch (ArgumentException) {
throw new ArgumentException($"Mismatching generator type for property {prop.Name}");
}
continue;
}
if (OnlyCustom)
{
continue;
}
if (TypeGenerators.ContainsKey(prop.PropertyType))
{
try {
prop.SetValue(obj, TypeGenerators[prop.PropertyType].Generate(), null);
} catch (ArgumentException) {
throw new ArgumentException($"Mismatching generator type for type {prop.PropertyType}");
}
continue;
}
Type type = prop.PropertyType;
if (type == typeof(string))
{
prop.SetValue(obj, ExtendedRandom.NextString(10), null);
}
else if (type == typeof(int) || type == typeof(long) || type == typeof(uint) || type == typeof(ulong))
{
prop.SetValue(obj, Random.Next(1, 500), null);
}
else if (type == typeof(byte))
{
prop.SetValue(obj, Random.Next(0, 256), null);
}
else if (type == typeof(sbyte))
{
prop.SetValue(obj, Random.Next(-128, 128), null);
}
else if (type == typeof(short) || type == typeof(ushort))
{
prop.SetValue(obj, Random.Next(0, 32768), null);
}
else if (type == typeof(float) || type == typeof(double) || type == typeof(decimal))
{
prop.SetValue(obj, Convert.ChangeType(ExtendedRandom.NextDouble(0, 500), type), null);
}
else if (type == typeof(bool))
{
prop.SetValue(obj, ExtendedRandom.NextBoolean(), null);
}
else if (type == typeof(char))
{
prop.SetValue(obj, ExtendedRandom.NextChar(), null);
}
else if (type == typeof(Guid))
{
prop.SetValue(obj, Guid.NewGuid(), null);
}
else if (type == typeof(DateTime))
{
prop.SetValue(obj, ExtendedRandom.NextDateTime(), null);
}
}
return(obj);
}
public void WeightedChoice_WithWeightsBasedOnLength_ReturnsCorrectWeighting()
{
var items = new[] {"to", "one", "three"};
var totals = new[] {0, 0, 0};
for (var i = 0; i < 1000000; i++)
{
var item = Random.WeightedChoice(items, s => s.Length);
for (var j = 0; j < items.Length; j++)
{
if (items[j] == item)
{
totals[j]++;
}
}
}
// Statistically, this should never fail...
Assert.AreEqual(totals[0], 200000, 2000);
Assert.AreEqual(totals[1], 300000, 2000);
Assert.AreEqual(totals[2], 500000, 2000);
}
public void SetSeed(int seed)
{
rnd = new ExtendedRandom(seed);
}