Vectorization vs loops in MATLAB - Hands-On Comparison

Vectorization vs loops

📖 Scenario: You work as a data analyst and need to process a list of numbers to find their squares. You want to learn how to do this efficiently in MATLAB using both loops and vectorization.

🎯 Goal: Build a MATLAB script that first creates a vector of numbers, then uses a loop to square each number, and finally uses vectorization to do the same task more efficiently. You will compare both methods by printing the results.

📋 What You'll Learn

Create a vector called numbers with values from 1 to 5

Create a zero vector called squares_loop of the same size as numbers

Use a for loop with variable i to square each element of numbers and store in squares_loop

Create a vector called squares_vectorized that contains the squares of numbers using vectorized operation

Print both squares_loop and squares_vectorized to compare

💡 Why This Matters

🌍 Real World

Data analysts and engineers often need to process large sets of numbers quickly. Vectorization helps make code faster and cleaner.

💼 Career

Knowing how to replace loops with vectorized operations is a valuable skill in MATLAB programming for scientific computing, data analysis, and engineering tasks.

1

Create the vector of numbers

Create a vector called numbers with the values [1 2 3 4 5].

MATLAB

# Create the vector 'numbers' with values [1 2 3 4 5]
numbers = [];
% Your code here

Need a hint?

Use square brackets to create a row vector in MATLAB.

2

Create a zero vector for loop results

Create a zero vector called squares_loop of the same size as numbers using the zeros function.

MATLAB

numbers = [1 2 3 4 5];
% Create a zero vector 'squares_loop' same size as 'numbers'
squares_loop = [];
% Your code here

Need a hint?

Use zeros(size(numbers)) to create a zero vector matching numbers.

3

Square numbers using a for loop

Use a for loop with variable i from 1 to length of numbers to square each element and store it in squares_loop(i).

MATLAB

numbers = [1 2 3 4 5];
squares_loop = zeros(size(numbers));
% Use a for loop with 'i' from 1 to length(numbers) to square each element
for i = 1:length(numbers)
    % Your code here
end

Need a hint?

Inside the loop, square numbers(i) and assign it to squares_loop(i).

4

Square numbers using vectorization and print results

Create a vector called squares_vectorized by squaring numbers using vectorized operation. Then print squares_loop and squares_vectorized using disp.

MATLAB

numbers = [1 2 3 4 5];
squares_loop = zeros(size(numbers));
for i = 1:length(numbers)
    squares_loop(i) = numbers(i)^2;
end
% Create 'squares_vectorized' by squaring 'numbers' using vectorized operation
squares_vectorized = [];
% Print both 'squares_loop' and 'squares_vectorized'
disp('Squares using loop:');
disp(squares_loop);
disp('Squares using vectorization:');
disp(squares_vectorized);

Need a hint?

Use the element-wise power operator .^ to square the vector numbers.

Use disp to print text and vectors.