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"""
Simple interface to SyncRNG. This file defines a SyncRNG object which can be
used to seed and pull numbers from the RNG.
"""
from __future__ import division
from warnings import warn as _warn
import syncrng
class SyncRNG(object):
def __init__(self, seed=0):
self.BPF = 32
self.seed = seed
self.state = syncrng.seed(seed)
def randi(self):
tmp = syncrng.rand(self.state)
self.state = tmp[:-1]
return(tmp[-1])
def rand(self):
return self.randi() * 2.3283064365387e-10
def randbelow(self, n):
maxsize = 1<<self.BPF
if n >= maxsize:
_warn("Underlying random generator does not supply \n"
"enough bits to choose from a population range this "
"large.\n")
return int(self.rand() * n)
rem = maxsize % n
limit = (maxsize - rem) / maxsize
r = self.rand()
while r >= limit:
r = self.rand()
return int(r*maxsize) % n
def shuffle(self, x):
y = x[:]
for i in reversed(range(1, len(y))):
j = self.randbelow(i+1)
y[i], y[j] = y[j], y[i]
return y
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