matplotlib绘图-正弦和余弦

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="$cos(x^2)$")

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()