Test a PRNG

#!/usr/bin/env python

import random
import matplotlib.pyplot as mpl_plot
import mpl_toolkits.mplot3d as mpl_plot3d

def simple_rand():
    rand_next = 1
    while True:
        rand_next = rand_next * 1234567 + 12345
#        rand_next = rand_next * 1103515245 + 12345;
        rand_next = rand_next % (2**32)
        yield rand_next

def get_random_f():
    #return random.randint(0, 2**32-1)
    #return random.SystemRandom().randint(0, 2**32-1)
    return simple_rand()

get_random = get_random_f()
prev3 = get_random.next()
prev2 = get_random.next()
prev = get_random.next()

x = []
y = []
z = []
for i in range(0, 2**16-1):
    new = get_random.next()
    x.append(new - prev)
    y.append(prev - prev2)
    z.append(prev2 - prev3)

    prev3 = prev2
    prev2 = prev
    prev = new

fig = mpl_plot.figure()
ax = mpl_plot3d.Axes3D(fig)
mpl_plot3d.Axes3D.scatter(ax, x, y, zs=z, linewidth=1)
mpl_plot.savefig("test-prng.png", format="png")