Tom Xue - 1 year ago 50
Python Question

# What does the $\ symbol mean in Python code? I find below code from a book to show how to use matplotlib in Python. The code runs normally. But I don't understand what does the symbol$ or $\ mean here? # -*- coding: utf-8 -*- import numpy as np import matplotlib.pyplot as plt x = np.linspace(0, 10, 1000) y = np.sin(x) + 1 z = np.cos(x**2) + 1 plt.figure(figsize = (8, 4)) plt.plot(x,y,label = '$\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()  Answer It doesn't mean anything in Python. $ marks the beginning and end of maths in a LaTeX string.

$\sin x+1$ means $\sin x+1$

Similarly, $\cos x^2+1$ will be $\cos x^2+1$

For a basic tutorial in MathJax (which uses LaTeX syntax) read this.

Source (Stackoverflow)