Anonymous functions in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an anonymous function in MATLAB?

An anonymous function is a simple, unnamed function defined in a single line using the @ symbol. It allows quick creation of functions without saving them as separate files.

beginner

How do you define an anonymous function that squares a number x in MATLAB?

You write: square = @(x) x.^2; This creates a function named 'square' that returns x squared.

beginner

Can anonymous functions in MATLAB accept multiple inputs? Give an example.

Yes. For example: add = @(a,b) a + b; This function adds two inputs a and b.

intermediate

What is a common use case for anonymous functions in MATLAB?

They are often used for quick calculations, passing functions as arguments to other functions like arrayfun or integral, without creating separate function files.

intermediate

How do anonymous functions capture variables from the workspace?

Anonymous functions can use variables defined outside their definition. These variables are 'captured' by value at the time the function is created.

How do you start defining an anonymous function in MATLAB?

A With the # symbol

B With the function keyword

C With the $ symbol

D With the @ symbol

Anonymous functions in MATLAB always start with the @ symbol followed by input arguments.

What does this anonymous function do? f = @(x) x + 5;

A Subtracts 5 from input x

B Multiplies input x by 5

C Adds 5 to input x

D Divides input x by 5

The function adds 5 to the input x.

Can anonymous functions be saved as separate files in MATLAB?

A No, they are defined inline

B Yes, always

C Only if named

D Only in scripts

Anonymous functions are meant to be quick, inline functions and are not saved as separate files.

Which of these is a valid anonymous function with two inputs?

A lambda x,y: x*y

B @(x,y) x*y

C def f(x,y): x*y

D function(x,y) x*y

MATLAB anonymous functions use @(inputs) expression syntax.

What happens if an anonymous function uses a variable from outside its definition?

A It captures the variable's value at creation time

B It ignores the variable

C It causes an error

D It updates the variable dynamically

Anonymous functions capture external variables by value when created.

Explain how to create and use an anonymous function in MATLAB with an example.

Think about how you write a quick function without a file.

Describe a practical situation where anonymous functions are useful in MATLAB programming.

Consider when you want to do small tasks inside other functions.