Create a Structured array with Name, Age, and Height in NumPy

Last update on March 26 2025 13:18:02 (UTC/GMT +8 hours)

1. Structured Array Creation

Creating a Structured Array:

Write a NumPy program that creates a structured array with fields for 'name' (string), 'age' (integer), and 'height' (float). Populate it with sample data for five individuals.

Sample Solution:

Python Code:

import numpy as np

# Define the data type for the structured array
dtype = [('name', 'U10'), ('age', 'i4'), ('height', 'f4')]

# Create the structured array with sample data
structured_array = np.array([
    ('Lehi Piero', 25, 5.5),
    ('Albin Achan', 30, 5.8),
    ('Zerach Hava', 35, 6.1),
    ('Edmund Tereza', 40, 5.9),
    ('Laura Felinus', 28, 5.7)
], dtype=dtype)

# Print the structured array
print("Structured Array:")
print(structured_array)

Output:

Structured Array:
[('Lehi Piero', 25, 5.5) ('Albin Acha', 30, 5.8) ('Zerach Hav', 35, 6.1)
 ('Edmund Ter', 40, 5.9) ('Laura Feli', 28, 5.7)]

Explanation:

• Import Libraries:
• Imported numpy as "np" for array creation and manipulation.
• Define Data Type:
• Define the data type for the structured array using a list of tuples. Each tuple specifies a field name and its corresponding data type. The data types are:
• 'U10' for a string of up to 10 characters.
• 'i4' for a 4-byte integer.
• 'f4' for a 4-byte float.
• Create Structured Array:
• Created the structured array using np.array(), providing sample data for five individuals. Each individual is represented as a tuple with values for 'name', 'age', and 'height'.
• Print the structured array to display the populated data.

For more Practice: Solve these Related Problems:

• Write a Numpy program to create a structured array with additional fields (e.g., 'weight') and populate it with sample data, ensuring proper dtype alignment.
• Write a Numpy program to generate a structured array from a list of tuples and verify the field names and dtypes.
• Write a Numpy program to create a structured array with non-uniform string lengths for the 'name' field and test its memory usage.
• Write a Numpy program to build a structured array with fields 'name', 'age', and 'height', and then dynamically update the dtypes of each field.

Python-Numpy Code Editor:

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