Crate randu

RANDU is Pseudo random multiplicative congruential generator MCG65539 used during 1960’s and 1970’s in the IBM Scientific Subroutine Library for IBM System/360 computers. Oesis A096555.

RANDU uses following MCG coeficients:

• multiplier a = 65539 ( 2^16 + 3 )
• modulus m = 2147483648 ( 2^31 )

RANDU generates non negative 31-bit integers with 2^29 period. Generated values fails the spectral test for dimensions greater than 2 and have low randomness in lower bits.

This is free and unencumbered software released into the public domain.

Structs

RANDU

Structure holding current state of RANDU generator.

Constants

A

multiplier A coeficient 2^16 + 3

C

C = 0 in MCG generators

M

modulus M coeficient 2^31

MAX

Maximum generated number

MIN

Minimum generated number

PERIOD

Generator period 2^29

SEED

RANDU start value

Functions

clamp_seed

clamps seed into valid range for generator.

validate_seed

Validate if supplied integer is in valid range of seeds for generator.