default-wave.py

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0.0, 1.0, 1000)

y = np.sin(x * np.pi * 2)

plt.figure(figsize=(18, 3))

plt.subplot(141)
plt.title("sine", fontsize=18)
plt.xticks([])
plt.yticks([])
plt.ylim(-1.1, +1.1)
plt.plot(y, linewidth=2)

y = 2 * x
y[y > 1] -= 2

plt.subplot(142)
plt.title("sawtooth", fontsize=18)
plt.xticks([])
plt.yticks([])
plt.ylim(-1.1, +1.1)
plt.plot(y, linewidth=2)

y[:500] = 1
y[500:] = -1

plt.subplot(143)
plt.title("square", fontsize=18)
plt.xticks([])
plt.yticks([])
plt.ylim(-1.1, +1.1)
plt.plot(y, linewidth=2)

y = x * 4
y[250:750] = 2 - y[250:750]
y[750:] = -4 + y[750:]

plt.subplot(144)
plt.title("triangle", fontsize=18)
plt.xticks([])
plt.yticks([])
plt.ylim(-1.1, +1.1)
plt.plot(y, linewidth=2)

plt.show()