/// <summary>
/// Creates a
/// Mersenne Twister 19937 generator having the
/// specified seed.
/// </summary>
/// <param name="seed">The seed of the generator.</param>
/// <returns>The MT 19937 generator having the specified seed.</returns>
/// <remarks>
/// <para>
/// The MT 19937 generator has a period length equal
/// to <latex mode='inline'>2^19937</latex>.
/// </para>
/// </remarks>
/// <seealso href="https://en.wikipedia.org/wiki/Mersenne_Twister"/>
public static RandomNumberGenerator CreateMT19937(int seed)
{
var descriptor = VslSafeStreamStateDescriptor.Create(
SafeNativeMethods.VSL.BRNG.VSL_BRNG_MT19937,
seed);
return(new RandomNumberGenerator(descriptor));
}
/// <summary>
/// Creates the next pseudo random generator in the sequence of
/// Mersenne Twister 2203 generators having the
/// specified seed.
/// </summary>
/// <param name="seed">The seed of the generator.</param>
/// <returns>The next MT 2203 generator having the specified seed.</returns>
/// <remarks>
/// <para>
/// There are <c>6024</c> MT2203 pseudo random number generators.
/// The MT 2203 generators guarantee mutual
/// independence of the corresponding random number sequences.
/// Every MT 2203 generator has a period length equal
/// to <latex mode='inline'>2^2203</latex>.
/// </para>
/// <para>
/// Method <see cref="CreateNextMT2203(int)"/> increments the iterator
/// to the next position in the sequence, or to the first position beyond the
/// end of sequence if the sequence has been completely traversed.
/// </para>
/// </remarks>
/// <seealso href="https://en.wikipedia.org/wiki/Mersenne_Twister"/>
public static RandomNumberGenerator CreateNextMT2203(int seed)
{
Interlocked.CompareExchange(ref mersenneTwister2203, -1, 6023);
int currentGenerator = Interlocked.Increment(ref mersenneTwister2203);
var descriptor = VslSafeStreamStateDescriptor.Create(
SafeNativeMethods.VSL.BRNG.VSL_BRNG_MT2203 + currentGenerator,
seed);
return(new RandomNumberGenerator(descriptor));
}
private RandomNumberGenerator(VslSafeStreamStateDescriptor descriptor)
{
this.descriptor = descriptor;
}
