不要问我什么是方波，小心川川锤你哦！
代码：
import matplotlib.pyplot as plt import numpy as np x = np.linspace(0, 10, 1000) y=0 for k in range(1, 10, 1): y=y+4*np.sin((2*k-1)*x)/((2*k-1)*np.pi) plt.plot(x,y,'k',color='r',label="w=1",linewidth=3) plt.axis([0,10,-1.5,1.5]) plt.legend() plt.show()
