1、引入计算库numpy和绘图库matplotlib：import numpy as npimport matplotlib.pyplot as plt
2、创建图像并绘制正弦和余弦函数：plt.figure(figsize=(8,4))plt.plot(x,y,label="$sin(x)$",color="red",linewidth=2)plt.plot(x,z,'b--',label="$cos(x^2)$")
3、设置横轴、纵轴标签，并设置主题钱砀渝测（title），最后使用show()函数将图显示出来，也可以实用保存命令将图保存到特定路径：plt.xlabel("Time(s)")plt.ylabel("Voltage(V)")plt.title("Matplotlib First Demon")plt.legend()plt.show()
4、全部代码如下：import numpy as npimport matplotlib.pyplot as pltx=np.linspace(0,10,1000)y=np.sin(x)z=np.cos(x**2)plt.figure(figsize=(8,4))plt.plot(x,y,label="$sin(x)$",color="red",linewidth=2)plt.plot(x,z,'b--',label="$cos(x^2)$")plt.xlabel("Time(s)")plt.ylabel("Voltage(V)")plt.title("Matplotlib First Demon")plt.legend()plt.show()
