Stopping circle.py

From Werner KRAUTH

import random
N_trials = 100000
N = 6
data = [0] * N
for iter in range(N_trials):
    NotVisited = set([k for k in range(N)])
    x = 0
    if random.uniform(0.0, 1.0) < 1.0 / N:
        data[x] += 1.0 / N_trials
    else:
        NotVisited = set([k for k in range(N)])
        NotVisited.discard(x)
        while len(NotVisited) > 0:
            sigma = random.choice([-1, 1])
            x = (x + sigma) % N
            NotVisited.discard(x)
        data[x] += 1.0 / N_trials
print('stopping samples')
for k in range(N):
    print('site = ', k,' probability = ', data[k])

site =  0  probability =  0.1673
site =  1  probability =  0.1671
site =  2  probability =  0.1645
site =  3  probability =  0.1657
site =  4  probability =  0.1656
site =  5  probability =  0.1696