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Exponential Distribution in NumPy - GeeksforGeeks

Last Updated : 23 Apr, 2025

The Exponential Distribution is a fundamental concept in probability and statistics. It describe the time between events in a Poisson process where events occur continuously and independently at a constant average rate. You can generate random numbers which follow exponential Distribution using  numpy.random.exponential() method.

Syntax : numpy.random.exponential(scale=1.0, size=None)

• scale : The inverse of the rate parameter (β=1/λ) which determines the spread of the distribution.
• size : The shape of the returned array.

To generate a single random number from a default Exponential Distribution (scale=1):

import numpy as np

random_number = np.random.exponential()
print(random_number)

Output:

0.008319485004465102

To generate multiple random numbers:

random_numbers = np.random.exponential(size=5)
print(random_numbers)

Output:

[1.15900802 0.1997201 0.73995988 0.19688073 0.54198053]

Visualizing the generated numbers helps in understanding their behavior. Below is an example of plotting a histogram of random numbers generated using numpy.random.exponential.

import numpy as np
import matplotlib.pyplot as plt
import seaborn as sns

scale = 2  
size = 1000  

data = np.random.exponential(scale=scale, size=size)

sns.histplot(data, bins=30, kde=True, color='orange', edgecolor='black')

plt.title(f"Exponential Distribution (Scale={scale})")
plt.xlabel("Value")
plt.ylabel("Frequency")
plt.grid(True)

plt.show()

Output:

The above image shows an Exponential Distribution with a scale parameter of 2. The histogram represents simulated data while the orange curve depicts the theoretical distribution.

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