python 添加图例

Sigma (𝜎) is very often used greek mathematical letters and has a higher repetition in probability. In this article, we are going to add 𝜎 using a command in matplotlib.

Sigma(𝜎)是希腊数学字母中经常使用的字母，其重复率更高。 在这篇文章中，我们将添加σ在matplotlib使用命令。

plt.text(3, 0.4, r'$\sigma=100$')
#Adding 𝜎 as text

plt.title('Errorbar with 'r'$\sigma=100$')
#Adding 𝜎 in title of the figure

plt.xlabel('Time ('r'$\sigma=100)$')
#Adding 𝜎 in title of the figure

plt.ylabel('Variation ('r'$\sigma=100)$')
#Adding 𝜎 in title of the figure

在情节标签中添加omega的Python代码 (Python code for adding omega in plot label)

import numpy as np
import matplotlib.pyplot as plt
x = np.arange(0.1, 5, 0.1)
y = np.sin(x)*np.exp(-x)
# In text
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.title('Errorbar')
plt.text(4, 0.0, r'$\sigma=100$')
plt.grid()
plt.show()
# In title
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.title('Plotting with 'r'$\sigma=100$')
plt.grid()
plt.show()
# In x-axis label
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.xlabel('Time ('r'$\sigma=100)$')
plt.grid()
plt.show()
# In y-axis label
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.ylabel('Function ('r'$\sigma=100)$')
plt.grid()
plt.show()

Output:

输出：

Output is as figure

翻译自: https://www.includehelp.com/python/adding-sigma-in-plot-label.aspx

python 添加图例