MixMaxRandom

class MixMaxRandom

Reproducible random number stream backed by the MIXMAX generator [1].

Used wherever madspace needs a CPU-side RNG stream outside the compute graph, for example while completing LHE events; see LHECompleter::complete_event_data. A DerivedSeed keys the stream to a specific call site so independent streams stay reproducible under a single top-level run seed.

References

• [1] K. Savvidy, “The MIXMAX random number generator”, Comput. Phys. Commun. 196 (2015) 161, https://doi.org/10.1016/j.cpc.2015.06.003

Public Functions

inline MixMaxRandom()

Non-deterministically seeded stream.

inline MixMaxRandom(DerivedSeed seed)

Parameters:

seed – The derived seed to start the stream from.

inline explicit MixMaxRandom(std::uint64_t seed)

Stream seeded directly from a raw 64-bit value.

inline void set_seed(DerivedSeed seed)

Re-seed the stream; see the DerivedSeed constructor.

inline double generate_double()

Draw a uniform value in [0, 1).

inline std::size_t generate_int(std::size_t max_int)

Draw a uniform integer in [0, max_int).