public FrequencyElementGenerator(IEnumerable <T> elements, IRandom random)
{
elements.ThrowIfNull("elements");
var counts = new Dictionary <T, float>();
foreach (var element in elements)
{
if (counts.ContainsKey(element))
{
counts[element]++;
}
else
{
counts[element] = 1;
}
}
var indexGenerator = new FrequencyIntGenerator(counts.Values, random);
elementGenerator = new ListSelectorGenerator <T>(counts.Keys, indexGenerator);
}
/// <summary>Constructs a new MarkovChain2IntGenerator
/// </summary>
/// <param name="frequencies">The conditional frequencies for the elements to generate,
/// where frequencies[m][n] is the relative prob of generating n given m was generated
/// the last time </param>
/// <param name="random">The random generator to use.</param>
public MarkovChain2IntGenerator(float[][] frequencies, IRandom random)
{
int symbolCount = frequencies.Length;
var initialFrequencies = new float[symbolCount];
generators = new FrequencyIntGenerator[symbolCount];
for (int i = 0; i < symbolCount; i++)
{
for (int j = 0; j < symbolCount; j++)
{
initialFrequencies[j] += frequencies[i][j];
}
generators[i] = new FrequencyIntGenerator(frequencies[i], random);
}
var initialGenerator = new FrequencyIntGenerator(initialFrequencies, random);
lastSymbol = initialGenerator.Next();
}