block probability

block-probability.py

import matplotlib
import numpy.random
import matplotlib.pyplot as plt
from matplotlib.ticker import FuncFormatter

#https://www.reddit.com/r/Bitcoin/comments/4gp28d/how_to_avoid_getting_ripped_off_in_large_btc/
#https://en.bitcoin.it/wiki/Confirmation

cumulative = True

def to_percent(y, position):
    # Ignore the passed in position. This has the effect of scaling the default
    # tick locations.
    s = str(100 * y)
    # The percent symbol needs escaping in latex
    if matplotlib.rcParams['text.usetex'] is True:
        return s + r'$\%$'
    else:
        return s + '%'

plt.clf()
plt.hist(numpy.random.exponential(10, 1e7), bins=100, normed=True, cumulative=cumulative)
plt.xlim(0, 80)
plt.xlabel('Minutes waited' if cumulative else 'Minutes between blocks')
plt.ylabel('Probability of block being found' if cumulative else 'Probability')
plt.title('Block waiting time' if cumulative else 'Time between blocks')
plt.grid(1)

plt.gca().yaxis.set_major_formatter(FuncFormatter(to_percent))

#plt.show()
plt.savefig('block-cumulative-interval.png' if cumulative else 'block-interval.png')

Wuttichai Chauymouang