Created
October 24, 2018 13:26
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Xorshift and xorshift+ implementation in Python
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def xorshift128(): | |
'''xorshift | |
https://ja.wikipedia.org/wiki/Xorshift | |
''' | |
x = 123456789 | |
y = 362436069 | |
z = 521288629 | |
w = 88675123 | |
def _random(): | |
nonlocal x, y, z, w | |
t = x ^ ((x << 11) & 0xFFFFFFFF) # 32bit | |
x, y, z = y, z, w | |
w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)) | |
return w | |
return _random | |
def main(): | |
r = xorshift128() | |
for i in range(10): | |
print(r()) | |
if __name__ == '__main__': | |
main() |
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def xorshift128plus(): | |
'''xorshift+ | |
https://en.wikipedia.org/wiki/Xorshift#xorshift+ | |
シフト演算で使用している 3 つの数値は元論文 Table.1 参照 | |
http://vigna.di.unimi.it/ftp/papers/xorshiftplus.pdf | |
doi:10.1016/j.cam.2016.11.006 | |
''' | |
s0 = 1 | |
s1 = 2 | |
def _random(): | |
nonlocal s0, s1 | |
x, y = s0, s1 | |
x = x ^ ((x << 23) & 0xFFFFFFFFFFFFFFFF) # 64bit | |
x = (x ^ (x >> 17)) ^ (y ^ (y >> 26)) | |
s0, s1 = y, x | |
return s0 + s1 | |
return _random | |
def main(): | |
r = xorshift128plus() | |
for i in range(10): | |
print(r()) | |
if __name__ == '__main__': | |
main() |
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