TRandomGenerator Class

type TRandomGenerator = class

Random generator.

Use this class to generate streams of random numbers. To achieve independence between two series of random numbers there are three options: 1. create several instances of this class and initialize each with a different seed. (and maybe a different random generator). 2. create a single instance of this class and use leapfroging. 3. create a single instance of this class and use block splitting.

Examples

delphi

var rnd    : TRandomGenerator;
    IntVec : TVecInt;
begin
    if Seed = -1 then Seed := aRound(Random*High(Cardinal));

    rnd := TRandomGenerator.Create;
    IntVec := TVecInt.Create;
    try
        IntVec.Size(Results.Length, prInt32);

        rnd.StreamCount := 1;
        rnd.Init(rgMRG32k3a,Seed);
        rnd.Streams[0].RandomBinomial(IntVec,an,p);
        Results.Copy(IntVec);
    finally
        rnd.Free;
        IntVec.Free;
    end
end;

Properties

Name	Type	Description
BasicRngType	TBasicRandomGenerator	The basic random generator used.
BlockStep	Integer	A parameter to the block splitting method to achieve stream independence.
Item	TRngStream	A list of independent random streams.
Seed	Integer	The random generator seed.
StreamCount	Integer	Number of independent random streams.
StreamIndependence	TRngStreamIndependence	Specifies the method to achieve random stream independence.

Methods

Name	Description
Init	Initializes random generator.
LoadFromFile	Loads random generator state from File.
LoadFromStream	Loads random generator state from Src.
SaveToFile	Saves random generator state to File.
SaveToStream	Saves random generator state to Dst.