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class mt19937(object): | |
# https://github.com/james727/MTP/ | |
def __init__(self, seed = 0): | |
self.state = [0]*624 | |
self.f = 1812433253 | |
self.m = 397 | |
self.u = 11 | |
self.s = 7 | |
self.b = 0x9D2C5680 | |
self.t = 15 | |
self.c = 0xEFC60000 | |
self.l = 18 | |
self.index = 624 | |
self.lower_mask = (1<<31)-1 | |
self.upper_mask = 1<<31 | |
# update state | |
self.state[0] = seed | |
for i in range(1,624): | |
self.state[i] = self.int_32(self.f*(self.state[i-1]^(self.state[i-1]>>30)) + i) | |
def twist(self): | |
for i in range(624): | |
temp = self.int_32((self.state[i]&self.upper_mask)+(self.state[(i+1)%624]&self.lower_mask)) | |
temp_shift = temp>>1 | |
if temp%2 != 0: | |
temp_shift = temp_shift^0x9908b0df | |
self.state[i] = self.state[(i+self.m)%624]^temp_shift | |
self.index = 0 | |
def get_random_number(self): | |
if self.index >= 624: | |
self.twist() | |
y = self.state[self.index] | |
y = y^(y>>self.u) | |
y = y^((y<<self.s)&self.b) | |
y = y^((y<<self.t)&self.c) | |
y = y^(y>>self.l) | |
self.index+=1 | |
return self.int_32(y) | |
def int_32(self, number): | |
return int(0xFFFFFFFF & number) | |
# Usage: | |
mt = mt19937(0) | |
print(mt.get_random_number()) | |
# Demo: https://repl.it/@DusanKlinec/MersenneTwisterPython?language=python3 | |
""" | |
// Equivalent to: https://repl.it/@DusanKlinec/MersenneTwisterCpp | |
#include <iostream> | |
#include <random> | |
int main() { | |
std::mt19937 mt; | |
mt.seed(0); | |
std::cout << mt(); | |
} | |
OR python: | |
$> pip install randomgen | |
from randomgen import MT19937 | |
rg = MT19937(0).generator | |
rg.random_raw() | |
""" |
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