Matrix creation in MATLAB - Mini Project: Build & Apply

Matrix creation

📖 Scenario: You are working with data in a lab where you need to organize numbers in a grid format. This grid is called a matrix. Matrices are useful for storing and working with numbers in rows and columns, like a table.

🎯 Goal: You will create a matrix in MATLAB with specific numbers arranged in rows and columns. This will help you understand how to build and display matrices.

📋 What You'll Learn

Create a matrix variable with exact numbers and arrangement

Create a variable for the number of rows in the matrix

Use a loop to calculate the sum of all elements in the matrix

Display the sum of the matrix elements

💡 Why This Matters

🌍 Real World

Matrices are used in many fields like engineering, physics, and computer graphics to organize and process data in rows and columns.

💼 Career

Knowing how to create and manipulate matrices is important for jobs in data analysis, scientific computing, and software development.

1

Create the matrix

Create a matrix called A with these exact values arranged in 3 rows and 3 columns:
1 2 3
4 5 6
7 8 9

MATLAB

% Create the matrix A with the given values
% Your code here

Need a hint?

Use square brackets and semicolons to separate rows in MATLAB.

2

Create a variable for number of rows

Create a variable called rows that stores the number of rows in the matrix A using the size function.

MATLAB

A = [1 2 3; 4 5 6; 7 8 9];
% Create variable rows to hold number of rows in A
% Your code here

Need a hint?

Use size(A, 1) to get the number of rows.

3

Calculate sum of all elements

Create a variable called totalSum and use a for loop with variable i from 1 to rows to add all elements of each row in A to totalSum. Initialize totalSum to 0 before the loop.

MATLAB

A = [1 2 3; 4 5 6; 7 8 9];
rows = size(A, 1);
% Initialize totalSum to 0
% Use for loop with i from 1 to rows to add sum of each row to totalSum
% Your code here

Need a hint?

Use sum(A(i, :)) to add all elements in row i.

4

Display the total sum

Use disp to display the value of totalSum.

MATLAB

A = [1 2 3; 4 5 6; 7 8 9];
rows = size(A, 1);
totalSum = 0;
for i = 1:rows
    totalSum = totalSum + sum(A(i, :));
end
% Display totalSum
% Your code here

Need a hint?

Use disp(totalSum) to show the sum.