random_walk.py
# -*- coding: utf-8 -*- """ Created on Sun Oct 22 15:22:51 2017 @author: dqhpl """ from random import choice class RandomWalk(): """一个生成随机漫步数据的类""" def __init__(self, num_points = 5000): """初始化随机漫步的属性""" self.num_points = num_points """所有随机漫步都始于（0,0）""" self.x_values = [0] self.y_values = [0] def fill_walk(self): """计算机随机漫步包含的所有点""" #不断漫步，直到列表到达指定长度 while len(self.x_values)< self.num_points: #决定前进方向以及沿这个方向前进的距离 x_direction = choice([1, -1]) x_distance = choice([0,1,2,3,4]) x_step = x_direction * x_distance y_direction =choice([1,-1]) y_distance = choice([0,1,2,3,4]) y_step = y_direction * y_distance #拒绝原地踏步 if x_step == 0 and y_step == 0: continue #计算下一个点的x和y值 next_x = self.x_values[-1] + x_step next_y = self.y_values[-1] + y_step self.x_values.append(next_x) self.y_values.append(next_y)
rw_visual.py
# -*- coding: utf-8 -*-
"""
Created on Sun Oct 22 15:42:34 2017
@author: dqhpl
"""
import matplotlib.pyplot as plt
from random_walk import RandomWalk
#创建一个randomwalk实例，并将其包含的点都绘制出来
while True:
rw = RandomWalk()
rw.fill_walk()
point_numbers = list(range(rw.num_points))
#plt.scatter(rw.x_values, rw.y_values, c=point_numbers, cmap=plt.cm.Reds,
#edgecolor = 'none',s=3)
plt.plot(rw.x_values, rw.y_values)
#突出起点和终点
#plt.scatter(0,0, c='green', edgecolors=None, s=10)
#plt.scatter(rw.x_values[-1],rw.y_values[-1], c='red', edgecolor=None,s=10)
#隐藏坐标轴
#plt.show()
plt.savefig('randomwalk.png', bbox_inches = 'tight')
keep_running = input("Make another walk?(y/n)\n")
if keep_running == 'n':
break
