numpy绘制锯齿波和三角波

锯齿波和三角波

 三角波是对锯齿波取绝对值得到的

锯齿波的无穷级数展开:

Code

import numpy as np
import matplotlib.pyplot as plt

t = np.linspace(-np.pi, np.pi, 201)
k = np.arange(1, 99)
f = np.zeros_like(t)

for i in range(len(t)):
    f[i] = np.sum(np.sin(2 * np.pi * k * t[i])/k)
    
f = (-2 / np.pi) * f

plt.plot(t, f, lw=1.0)
plt.plot(t, np.abs(f), lw=2.0)
plt.show()