Python学习笔记--极坐标
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IDE:Pycharm
Python环境:python3.7
Matplotlib: Matplotlib 1.11
Numpy: Numpy1.15
函数积分图
1 import matplotlib.pyplot as plt
2 import numpy as np
3 from matplotlib.patches import Polygon
4
5 def func(x):
6 return -(x-2)*(x-8)+40
7
8 x = np.linspace(0,10)
9 y = func(x)
10
11 fig,axes = plt.subplots()
12 #绘制曲线
13 plt.plot(x,y,'r',linewidth = 2)
14 a=2
15 b=9
16
17 #坐标轴设置
18 axes.set_xticks([a,b])
19 axes.set_xticklabels(['$a$','$b$'])
20 axes.set_yticks([])
21 plt.figtext(0.9,0.05,'$x$')
22 plt.figtext(0.1,0.9,'$y$')
23
24 #绘制灰色多边形
25 ix=np.linspace(a,b)
26 iy=func(ix)
27 ixy = zip(ix,iy)
28 verts=[(a,0)]+list(ixy)+[(b,0)]
29 poly = Polygon(verts,facecolor='0.9',edgecolor='0.5')
30 axes.add_patch(poly)
31
32 #添加数学公式
33 x_math =(a+b)*0.5*0.8
34 y_math = 35
35 plt.text(x_math,y_math,'$int_a^b(-(x-2)*(x-8)+40)dx$',fontsize=10,horizontalalignment='center')
36 plt.show()
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