Python | Adding Nabla to Plot Label

Here, we are going to learn about the adding nabla to plot label and its Python implementation.
Submitted by Anuj Singh, on August 31, 2020

Nabla is very oftenly used greek mathematical letters. They are mostly used in physics and other mathematical expressions, especially, when there is topic related change (for example charge and electrodynamics) and therefore, they have registered an importance in languages.

Therefore, matplotlib has defined a command for usage.

In this article, we are going to add ∇ using a command in matplotlib.

```plt.text(3, 0.4, r'\$\nabla=100\$')
#Adding ∇ as text
```

```plt.title('nabla 'r'\$\nabla=100\$')
#Adding ∇ in title of the figure
```

```plt.xlabel('nabla ('r'\$\nabla=100)\$')
#Adding ∇ in x axis label of the figure
```

```plt.ylabel('nabla ('r'\$\nabla=100)\$')
#Adding ∇ in y axis label of the figure
```

Python code for adding nabla to plot label

```import numpy as np
import matplotlib.pyplot as plt

x = np.arange(10)
y = np.cos(x)*np.exp(x/5)

#  nabla
#In text
plt.figure()
plt.plot(x,y, '-o', color=  'purple')
plt.title('nabla')
plt.text(3, -2.2, r'\$\nabla=100\$')
plt.show()

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

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

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

Output:

```Output is as Figure
```

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