private static void ValidateByNameEnumDistributesWithCorrectWeights <TEnum>(int itemsPerBucket, float tolerance, int sampleSizePercentage) where TEnum : struct
{
itemsPerBucket = (itemsPerBucket * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
var random = XorShift128Plus.Create(seed);
var weights = new Dictionary <string, int>();
int weightSum = 0;
var buckets = new Dictionary <TEnum, int>();
var enumNames = System.Enum.GetNames(typeof(TEnum));
foreach (var name in enumNames)
{
int weight = random.RangeCC(3, 10);
weights.Add(name, weight);
weightSum += weight;
}
foreach (var name in enumNames)
{
TEnum enumValue = (TEnum)System.Enum.Parse(typeof(TEnum), name);
int currentTarget;
if (buckets.TryGetValue(enumValue, out currentTarget))
{
buckets[enumValue] = currentTarget + itemsPerBucket * enumNames.Length * weights[name] / weightSum;
}
else
{
buckets.Add(enumValue, itemsPerBucket * enumNames.Length * weights[name] / weightSum);
}
}
int iterations = 0;
foreach (var target in buckets.Values)
{
iterations += target;
}
var generator = random.MakeWeightedEnumGenerator <TEnum>((System.Func <string, int>)((string name) => weights[name]));
for (int i = 0; i < iterations; ++i)
{
int currentTarget;
TEnum enumValue = generator.Next();
if (buckets.TryGetValue(enumValue, out currentTarget))
{
buckets[enumValue] = currentTarget - 1;
}
else
{
Assert.Fail("An invalid enum value was generated.");
}
}
int[] bucketsArray = new int[buckets.Count];
buckets.Values.CopyTo(bucketsArray, 0);
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(bucketsArray, 0), tolerance * itemsPerBucket);
}
public static void ValidateHalfClosedDoubleUnitBucketDistribution(IRandom random, int bucketCount, int hitsPerBucket, float tolerance, int sampleSizePercentage)
{
hitsPerBucket = (hitsPerBucket * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
var buckets = new int[bucketCount];
for (int i = 0; i < bucketCount * hitsPerBucket; ++i)
{
var n = random.DoubleOC();
buckets[(int)System.Math.Ceiling(n * bucketCount) - 1] += 1;
}
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(buckets, hitsPerBucket), tolerance * hitsPerBucket);
}
public static void ValidateHalfOpenFloatUnitBucketDistribution(IRandom random, int bucketCount, int hitsPerBucket, float tolerance, int sampleSizePercentage)
{
hitsPerBucket = (hitsPerBucket * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
var buckets = new int[bucketCount];
for (int i = 0; i < bucketCount * hitsPerBucket; ++i)
{
var n = random.FloatCO();
buckets[Mathf.FloorToInt(n * bucketCount)] += 1;
}
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(buckets, hitsPerBucket), tolerance * hitsPerBucket);
}
private static void ValidateByNameEnumDistributesUniformly <TEnum>(int itemsPerBucket, float tolerance, int sampleSizePercentage) where TEnum : struct
{
itemsPerBucket = (itemsPerBucket * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
var buckets = new Dictionary <TEnum, int>();
var enumValues = System.Enum.GetValues(typeof(TEnum));
foreach (var value in enumValues)
{
TEnum enumValue = (TEnum)value;
int currentTarget;
if (buckets.TryGetValue(enumValue, out currentTarget))
{
buckets[enumValue] = currentTarget + itemsPerBucket;
}
else
{
buckets.Add(enumValue, itemsPerBucket);
}
}
int iterations = itemsPerBucket * enumValues.Length;
var random = XorShift128Plus.Create(seed);
var generator = random.MakeEnumGenerator <TEnum>(true);
for (int i = 0; i < iterations; ++i)
{
int currentTarget;
TEnum enumValue = generator.Next();
if (buckets.TryGetValue(enumValue, out currentTarget))
{
buckets[enumValue] = currentTarget - 1;
}
else
{
Assert.Fail("An invalid enum value was generated.");
}
}
int[] bucketsArray = new int[buckets.Count];
buckets.Values.CopyTo(bucketsArray, 0);
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(bucketsArray, 0), tolerance * itemsPerBucket);
}
private static void ValidateShuffleDistributesUniformly(int bucketCount, int iterations, float tolerance, System.Func <IRandom, IList <int> > shuffle, int sampleSizePercentage)
{
iterations = (iterations * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
var hitsPerBucket = (bucketCount / 2) * iterations;
int[] sumArray = new int[bucketCount];
var random = XorShift128Plus.Create(seed);
for (int i = 0; i < iterations; ++i)
{
IList <int> list = shuffle(random);
for (int j = 0; j < list.Count; ++j)
{
sumArray[j] += list[j];
}
}
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(sumArray, hitsPerBucket), tolerance * hitsPerBucket);
}
public void UnitVector2sUniformlyDistributed(int sampleSizePercentage)
{
var bucketCount = 72;
var hitsPerBucket = 144;
var tolerance = 0.1f;
hitsPerBucket = (hitsPerBucket * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
var random = XorShift128Plus.Create(seed);
var buckets = new int[bucketCount];
var twoPi = Mathf.PI * 2f;
for (int i = 0; i < bucketCount * hitsPerBucket; ++i)
{
var v = random.UnitVector2();
var a = Mathf.Atan2(v.y, v.x);
buckets[Mathf.FloorToInt((a + Mathf.PI) * bucketCount / twoPi)] += 1;
}
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(buckets, hitsPerBucket), tolerance * hitsPerBucket);
}
private void ValidateBitDistribution64(int count, Func <ulong> generator, int bitCount, float tolerance, int sampleSizePercentage)
{
count = (count * sampleSizePercentage) / 100;
tolerance = (tolerance * 100) / sampleSizePercentage;
ulong mask = 0xFFFFFFFFFFFFFFFFUL >> (64 - bitCount);
var buckets = new int[bitCount];
for (int i = 0; i < count; ++i)
{
ulong b = generator();
if (b > mask)
{
Assert.Fail(string.Format("Bit Count = {0}, Bits = 0x{1:X16}", bitCount, b));
}
ulong m = 1U;
for (int j = 0; j < bitCount; ++j)
{
if ((b & m) != 0U)
{
buckets[j] += 1;
}
m = m << 1;
}
}
var sb = new System.Text.StringBuilder();
sb.AppendFormat("Bit Count = {0}, Buckets = [ {1}", bitCount, buckets[0]);
for (int i = 1; i < bitCount; ++i)
{
sb.AppendFormat(", {0}", buckets[i]);
}
sb.Append(" ]");
Assert.LessOrEqual(RandomeEngineTests.CalculateStandardDeviation(buckets, count / 2), tolerance * count / 2, sb.ToString());
}