Cell array indexing (curly vs parentheses) in MATLAB - Hands-On Comparison

Cell Array Indexing: Curly Braces vs Parentheses in MATLAB

📖 Scenario: Imagine you are organizing a small collection of fruits and their colors using MATLAB cell arrays. You want to learn how to access the fruits and their colors correctly using different types of indexing.

🎯 Goal: Build a MATLAB script that creates a cell array with fruits and their colors, then uses both parentheses () and curly braces {} to access and display the data correctly.

📋 What You'll Learn

Create a cell array called fruits with exact entries: {'Apple', 'Red'; 'Banana', 'Yellow'; 'Grape', 'Purple'}

Create a variable called rowIndex and set it to 2

Use parentheses () to extract the second row as a cell array and store it in secondRow

Use curly braces {} to extract the color of the fruit in the second row and store it in color

Print secondRow and color to show the difference in output

💡 Why This Matters

🌍 Real World

Cell arrays are useful in MATLAB when you need to store mixed types of data, like strings and numbers, in one container. Understanding how to access data correctly helps in data analysis and organizing information.

💼 Career

Many engineering and data science jobs use MATLAB. Knowing how to work with cell arrays and their indexing is important for handling complex data structures efficiently.

1

Create the cell array fruits

Create a cell array called fruits with these exact entries: {'Apple', 'Red'; 'Banana', 'Yellow'; 'Grape', 'Purple'}

MATLAB

% Create the cell array fruits with the given entries
% Your code here

Need a hint?

Use curly braces {} to create a cell array with rows separated by semicolons and columns separated by commas.

2

Create the variable rowIndex

Create a variable called rowIndex and set it to 2

MATLAB

fruits = {'Apple', 'Red'; 'Banana', 'Yellow'; 'Grape', 'Purple'};
% Create the variable rowIndex and set it to 2
% Your code here

Need a hint?

Just assign the number 2 to the variable rowIndex.

3

Extract the second row using parentheses and the color using curly braces

Use parentheses () to extract the second row of fruits as a cell array and store it in secondRow. Then use curly braces {} to extract the color (second column) of the fruit in the second row and store it in color

MATLAB

fruits = {'Apple', 'Red'; 'Banana', 'Yellow'; 'Grape', 'Purple'};
rowIndex = 2;
% Extract the second row as a cell array using parentheses
% Extract the color of the fruit in the second row using curly braces
% Your code here

Need a hint?

Use () to get a cell array slice and {} to get the actual content inside the cell.

4

Print the results to show the difference

Write two disp statements to print secondRow and color to the MATLAB console

MATLAB

fruits = {'Apple', 'Red'; 'Banana', 'Yellow'; 'Grape', 'Purple'};
rowIndex = 2;
secondRow = fruits(rowIndex, :);
color = fruits{rowIndex, 2};
% Print secondRow and color
% Your code here

Need a hint?

Use disp to show the variables. Notice how secondRow shows as a cell array and color shows as a string.