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Python | Adding Sigma in Plot Label

In this article, we are going to learn how to add 𝜎 (sigma) letter in the plot label in Python?
Submitted by Anuj Singh, on July 18, 2020

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.

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

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:

Output is as figure