Python實現(xiàn)隨機游走的詳細解釋

 -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
import random

position=0#設置初始位置
walk=[]#保存位置
steps=500#設置步數(shù)為500步
for i in range(steps):
  step=1 if random.randint(0,1) else -1#如果隨機值等于0則step為1，反之為0
  position+=step#改變位置（正，負）
  walk.append(position)
fig=plt.figure()#生成窗口
ax=fig.add_subplot(211)#返回一個axes對象，里面的參數(shù)abc表示在一個figure窗口中，有a行b列個小窗口，然后本次plot在第c個窗口中
ax.plot(walk)

ax=fig.add_subplot(223)
ax.plot(walk)

ax=fig.add_subplot(224)
ax.plot(walk)
plt.show()
#print walk#打印每一次的累積步數(shù)

#-*- coding: utf-8 -*-

import matplotlib.pyplot as plt
import numpy as np

nwalks = 8
nsteps = 500
draws = np.random.randint(0, 2, size=(nwalks, nsteps)) # 0 or 1
steps = np.where(draws > 0, 1, -1)#每一次的步長
walks = steps.cumsum(1)#累積步數(shù)

fig = plt.figure()
ax = fig.add_subplot(111)
for i in range(nwalks):
  ax.plot(walks[i])

plt.show()