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# Python | Adding Lower/Uppercase Delta in Plot Label

Here, we are going to learn how to add lower/uppercase delta in plot label in Python?
Submitted by Anuj Singh, on July 20, 2020

𝛿(lowercase delta) and Δ(uppercase delta) are very often used greek mathematical letters. They are mostly used in physics and chemistry when there is topic related change (for example energy change, mass change, velocity change) and therefore, they have registered importance in languages.

Therefore, matplotlib has defined a command for 𝛿/Δ usage.

In this article, we are going to add 𝛿/Δ using a command in matplotlib.

## 1) Lowercase Delta

plt.text(3, 0.4, r'$\delta=100$')
#Adding 𝛿/Δ as text


plt.title('Lowercase Delta 'r'$\delta=100$')
#Adding 𝛿/Δ in title of the figure


plt.xlabel('Lowercase Delta ('r'$\delta=100)$')
#Adding 𝛿/Δ in title of the figure


plt.ylabel('Lowercase Delta ('r'$\delta=100)$')
#Adding 𝛿/Δ in title of the figure


## 2) Uppercase Delta

plt.text(3, 0.4, r'$\Delta=100$')
#Adding 𝛿/Δ as text


plt.title('Uppercase Delta 'r'$\Delta=100$')
#Adding 𝛿/Δ in title of the figure


plt.xlabel('uppercase Delta ('r'$\Delta=100)$')
#Adding 𝛿/Δ in title of the figure


plt.ylabel('Variation ('r'$\Delta=100)$')
#Adding 𝛿/Δ in title of the figure


## Python code for adding lower/uppercase delta 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)

#Lowercase Delta
#In text
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.title('Lowercase Delta')
plt.text(4, 0.0, r'$\delta=100$')
plt.grid()
plt.show()

#In title
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.title('Lowercase Delta 'r'$\delta=100$')
plt.grid()
plt.show()

#In x-axis label
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.xlabel('Lowercase Delta ('r'$\delta=100)$')
plt.grid()
plt.show()

#In y-axis label
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.ylabel('Lowercase Delta ('r'$\delta=100)$')
plt.grid()
plt.show()

#Uppercase Delta
#In text
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.title('uppercase Delta')
plt.text(4, 0.0, r'$\Delta=100$')
plt.grid()
plt.show()

#In title
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.title('uppercase Delta 'r'$\Delta=100$')
plt.grid()
plt.show()

#In x-axis label
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.xlabel('uppercase Delta ('r'$\Delta=100)$')
plt.grid()
plt.show()

#In y-axis label
plt.figure()
plt.plot(x,y, 'o', color='purple')
plt.ylabel('uppercase Delta ('r'$\Delta=100)$')
plt.grid()
plt.show()


Output:

Output is as figure

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