一、用一个简单的例子认识matplotlib
![在这里插入图片描述](https://img-blog.csdnimg.cn/4d8d022434a94a33a1194a830fc03472.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
import numpy as np
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.plot([1, 2, 3, 4], [1, 4, 6, 16])
![在这里插入图片描述](https://img-blog.csdnimg.cn/6baaf683d6464dbb85935be634dd03b4.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
fig, ax = plt.subplots()
ax.plot([1, 2, 3, 4], [1, 4, 6, 16]);
![在这里插入图片描述](https://img-blog.csdnimg.cn/22dc64cf75bd43c8aa0be13ded649812.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
plt.plot([1,2,3,4],[7,43,25,67])
plt.show()
![在这里插入图片描述](https://img-blog.csdnimg.cn/cb41cb9186054b4bb5dacf45daf76b6b.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
二、Figure的组成
![在这里插入图片描述](https://img-blog.csdnimg.cn/8164cd231a6a40e0b97b0be67954b439.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16) ![在这里插入图片描述](https://img-blog.csdnimg.cn/dac7bf41e3b9410283966ec0db14a6cd.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
三、两种绘图接口
![在这里插入图片描述](https://img-blog.csdnimg.cn/9e2493792d934d189a72b4c4820121c6.png)
1、显式创建figure和axes
x = np.linspace(0, 2, 100)
fig, ax = plt.subplots()
ax.plot(x, x, label='linear')
ax.plot(x, x**2, label='quadratic')
ax.plot(x, x**3, label='cubic')
ax.set_xlabel('x label')
ax.set_ylabel('y label')
ax.set_title('simple plot')
ax.legend()
plt.show()
![在这里插入图片描述](https://img-blog.csdnimg.cn/f9a878cdc60b4d0ca3f5200cf2202b5b.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16) 顺便复习一下subplots()吧![在这里插入图片描述](https://img-blog.csdnimg.cn/17565e5d30d44d7888443373eb83e25a.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
2、直接用pyplot自动创建figure和axes
x = np.linspace(0, 2, 100)
plt.plot(x, x, label='linear')
plt.plot(x, x**2, label='quadratic')
plt.plot(x, x**3, label='cubic')
plt.xlabel('x label')
plt.ylabel('y label')
plt.title('simple plot using pyplot.plot')
plt.show()
![在这里插入图片描述](https://img-blog.csdnimg.cn/47ecef2de67c4302bb3c3025adef319c.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBASl9jYWljYWljYWk=,size_20,color_FFFFFF,t_70,g_se,x_16)
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