matplotlib-隨機漫步
阿新 • • 發佈:2019-01-04
random_walk.py
# -*- coding: utf-8 -*-
"""
Created on Mon May 29 07:56:41 2017
@author: Administrator
"""
# -*- coding: utf-8 -*-
"""
Created on Mon May 29 07:52:39 2017
@author: Administrator
"""
from random import choice
class RandomWalk():
"""一個生成隨機漫步資料的類"""
def __init__(self, num_points=5000 ):
"""初始化隨機漫步的屬性"""
self.num_points = num_points
# 所有隨機漫步都始於(0, 0)
self.x_values = [0]
self.y_values = [0]
def fill_walk(self):
"""計算隨機漫步包含的所有點"""
# 不斷漫步, 直到列表達到指定的長度
while len(self.x_values) < self.num_points:
# 決定前進方向以及沿這個方向前進的距離
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
# 拒絕原地踏步
if x_step == 0 and y_step == 0:
continue
# 計算下一個點的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 Mon May 29 07:57:13 2017
@author: Administrator
"""
import matplotlib.pyplot as plt
from random_walk import RandomWalk
while True:
# 建立一個RandomWalk例項, 並將其包含的點都繪製出來
rw = RandomWalk(80000)
rw.fill_walk()
# 設定繪圖視窗的尺寸
plt.figure(figsize=(12, 8))
point_numbers = list(range(rw.num_points))
plt.scatter(rw.x_values, rw.y_values, c=point_numbers, cmap=plt.cm.Blues,
edgecolor='none', s=1)
# 突出起點和終點
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)
#plt.scatter(rw.x_values, rw.y_values, s=15)
# 隱藏座標軸
plt.axes().get_xaxis().set_visible(False)
plt.axes().get_yaxis().set_visible(False)
plt.show()
keep_running = input("Make another walk? (y/n): ")
if keep_running == 'n':
break
一張輸出圖片:
學習:《python程式設計:入門到實踐》