Type checking (class, isa) in MATLAB - Mini Project: Build & Apply

Type Checking with class and isa in MATLAB

📖 Scenario: You are working on a MATLAB program that processes different types of data inputs. To handle them correctly, you need to check the type of each input before processing.

🎯 Goal: Build a MATLAB script that creates variables of different types, sets a type to check against, uses class and isa functions to check types, and prints the results.

📋 What You'll Learn

Create variables of different types: numeric, character array, and cell array

Create a variable called typeToCheck with a string value representing a type

Use class function to get the type of a variable

Use isa function to check if a variable is of a certain type

Print the results of the type checks

💡 Why This Matters

🌍 Real World

Type checking is important when writing programs that handle different kinds of data. It helps avoid errors by making sure the data is the expected type before processing.

💼 Career

Many programming jobs require you to write code that safely handles inputs and data. Knowing how to check types in MATLAB is useful for data analysis, engineering simulations, and scientific computing.

1

Create variables of different types

Create a numeric variable called numVar with value 10, a character array called charVar with value 'hello', and a cell array called cellVar with value {1, 2, 3}.

MATLAB

% Your code here

Need a hint?

Use = to assign values. Numeric values are written as numbers, character arrays in single quotes, and cell arrays in curly braces.

2

Set the type to check

Create a variable called typeToCheck and set it to the string 'double'.

MATLAB

numVar = 10;
charVar = 'hello';
cellVar = {1, 2, 3};
% Your code here

Need a hint?

Use single quotes to create a string in MATLAB.

3

Check types using class and isa

Use the class function to get the type of numVar and store it in numVarType. Then use isa to check if charVar is of type typeToCheck and store the result in isCharVarType.

MATLAB

numVar = 10;
charVar = 'hello';
cellVar = {1, 2, 3};
typeToCheck = 'double';
% Your code here

Need a hint?

Use class(variable) to get the type name as a string. Use isa(variable, typeName) to check if variable is of that type.

4

Print the results

Print the value of numVarType and isCharVarType using disp function.

MATLAB

numVar = 10;
charVar = 'hello';
cellVar = {1, 2, 3};
typeToCheck = 'double';
numVarType = class(numVar);
isCharVarType = isa(charVar, typeToCheck);
% Your code here

Need a hint?

Use disp(variable) to print the value of a variable.