How to Use Anonymous Functions in MATLAB: Simple Guide

In MATLAB, you create an anonymous function using the @ symbol followed by input arguments in parentheses and the function expression. For example, f = @(x) x^2 defines a function that squares its input. You can then call it like a regular function, e.g., f(3) returns 9.

Syntax

An anonymous function in MATLAB is defined using the @ symbol, followed by input arguments in parentheses, and then the expression that uses those inputs.

• @: Indicates an anonymous function.
• (input_args): The inputs the function takes.
• expression: The calculation or operation the function performs.

matlab

f = @(x) x^2;

Example

This example shows how to create an anonymous function that squares a number and then use it to calculate the square of 5.

matlab

square = @(x) x^2;
result = square(5);
disp(result);

Output

25

Common Pitfalls

Common mistakes include forgetting the @ symbol, missing parentheses around input arguments, or using multiple statements without combining them properly.

Anonymous functions can only contain one expression, so complex operations need to be broken down or use regular functions.

matlab

wrong = (x) x^2; % Missing @ symbol
right = @(x) x^2; % Correct way

Quick Reference

Element	Description	Example
@	Defines an anonymous function	@(x) x+1
Input arguments	Variables the function uses	(x, y)
Expression	Operation performed	x^2 + y^2
Single expression	Only one operation allowed	No multiple statements

Key Takeaways

Use the @ symbol followed by input arguments and an expression to create anonymous functions.

Anonymous functions can be called like regular functions with inputs.

They can only contain one expression, so keep them simple.

Always include parentheses around input arguments.

Forgetting the @ symbol or using multiple statements causes errors.