matplotlib是python最著名的繪圖庫，主要用于二維作圖，也可以進行簡單的三維作圖，

簡單例子如下，環境和上一篇博客環境一樣：

import numpy as npimport matplotlib.pyplot as pltx = np.linspace(0, 10, 1000)y = np.sin(x) + 1z = np.cos(x**2) + 1plt.figure(figsize=(8, 4))plt.plot(x, y, label='$/sin x+1$', color='red', linewidth=2)plt.plot(x, z, 'b--', label='$/cos x^2+1$')plt.xlabel('Time(s)')plt.ylabel('Volt')plt.title('A simple example')plt.ylim(0, 2.2)plt.legend()plt.show()

import numpy as npimport matplotlib.pyplot as pltx = np.linspace(0, 10, 1000)y = np.sin(x) + 1z = np.cos(x**2) + 1plt.figure(figsize=(8, 4))plt.plot(x, y, label='$/sin x+1$', color='red', linewidth=2)plt.plot(x, z, 'b--', label='$/cos x^2+1$')plt.xlabel('Time(s)')plt.ylabel('Volt')plt.title('A simple example')plt.ylim(0, 2.2)plt.legend()plt.show()
所畫的圖形如下：