np.vstack() and np.hstack() in NumPy - Mini Project: Build & Apply

Stacking Arrays Vertically and Horizontally with np.vstack() and np.hstack()

📖 Scenario: Imagine you are organizing data from two different sensors. Each sensor gives you a small set of readings. You want to combine these readings to analyze them together.

🎯 Goal: You will create two small arrays of sensor readings, then combine them vertically and horizontally using np.vstack() and np.hstack(). Finally, you will print the combined arrays.

📋 What You'll Learn

Create two numpy arrays named sensor1 and sensor2 with exact values

Create a variable named combined_vertical using np.vstack() to stack arrays vertically

Create a variable named combined_horizontal using np.hstack() to stack arrays horizontally

Print both combined_vertical and combined_horizontal

💡 Why This Matters

🌍 Real World

Combining sensor data or measurements from different sources is common in data science to prepare data for analysis.

💼 Career

Understanding how to stack arrays helps in data preprocessing, a key skill for data scientists and analysts working with numerical data.

1

Create two numpy arrays with sensor readings

Import numpy as np. Create a numpy array called sensor1 with values [1, 2, 3] and another numpy array called sensor2 with values [4, 5, 6].

NumPy

import numpy as np
# Create sensor1 and sensor2 arrays with exact values
# Your code here

Need a hint?

Use np.array() to create arrays with the exact values given.

2

Stack the arrays vertically using np.vstack()

Create a variable called combined_vertical by stacking sensor1 and sensor2 vertically using np.vstack().

NumPy

import numpy as np
sensor1 = np.array([1, 2, 3])
sensor2 = np.array([4, 5, 6])
# Stack sensor1 and sensor2 vertically using np.vstack()
# Your code here

Need a hint?

Use np.vstack((sensor1, sensor2)) to stack arrays vertically.

3

Stack the arrays horizontally using np.hstack()

Create a variable called combined_horizontal by stacking sensor1 and sensor2 horizontally using np.hstack().

NumPy

import numpy as np
sensor1 = np.array([1, 2, 3])
sensor2 = np.array([4, 5, 6])
combined_vertical = np.vstack((sensor1, sensor2))
# Stack sensor1 and sensor2 horizontally using np.hstack()
# Your code here

Need a hint?

Use np.hstack((sensor1, sensor2)) to stack arrays horizontally.

4

Print the vertically and horizontally stacked arrays

Print the variables combined_vertical and combined_horizontal to see the stacked arrays.

NumPy

import numpy as np
sensor1 = np.array([1, 2, 3])
sensor2 = np.array([4, 5, 6])
combined_vertical = np.vstack((sensor1, sensor2))
combined_horizontal = np.hstack((sensor1, sensor2))
# Print combined_vertical and combined_horizontal
# Your code here

Need a hint?

Use print() to display both stacked arrays.