随机漫步
from random_walk import RandomWalk#!/usr/bin/env python# -*- coding:utf-8 -*-from random import choicefrom matplotlib import pyplot as pltclass RandoWalk(): '''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 :param num_points: ''' 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): '''计算随机漫步包含的所有点''' # 不断漫步,直到列表达式到指定长度 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)while True: # 创建一个RandomWalk实例,并将其包含的点都绘制出来 rw = RandoWalk(20000) rw.fill_walk() # 设置绘图窗口尺寸 # plt.figure(figsize=(10, 6)) # 单位英寸 plt.figure(dpi=128, figsize=(10, 6)) # 分辨率 point_numbers = list(range(rw.num_points)) plt.scatter(rw.x_values, rw.y_values, c=point_numbers, cmap=plt.cm.Blues, edgecolors='none', s=5) # 突出起点和终点 plt.scatter(0, 0, c='green', edgecolors='none', s=100) plt.scatter(rw.x_values[-1], rw.y_values[-1], c='red', edgecolors='none', s=100) # 隐藏坐标轴 plt.axes().get_xaxis().set_visible(False) plt.axes().get_yaxis().set_visible(False) plt.show() keep_running = raw_input("Make another walk?(y/n):") if keep_running == 'n': break