1 #!/usr/bin/python
2 # -*- coding: UTF-8 -*-
3
4 import matplotlib.pyplot as plt
5 import numpy as np
6 #To draw y =x^2 (-3<=x<=3)
7 x=[x for x in range(100)]
8 y = [ele**2 for ele in x]
9 z = [ele *2 for ele in x]
10 # plt.plot(x,y,'ro-',label="y=x^2")#作图:y关于x的曲线 label是曲线标签 "ro-"表示红色然后加o
11 plt.plot(x,y,'ro-',label=r"$y=x^2$")
12 # plt.plot(x,z,'g-',label="y =2x")#作图:z关于x的曲线 g-表示绿色
13 plt.plot(x,z,'g-',label=r"$y =2*x$")
14
15 plt.xlabel('x') #横坐标的标题
16 plt.ylabel('y') #纵坐标的标题
17 plt.title('Paralabo and line') #图的标题
18
19 plt.plot(z,y,)
20
21 plt.legend() #显示符号,即x和y曲线的说明
22 plt.show() #显示
