Matlab Functions Quiz

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35 essential questions on using built-in functions, understanding inputs/outputs, accessing documentation, and creating anonymous functions.

35 Questions

~70 minutes

Question 1

What is the correct syntax to call a function named 'myFunc' with input 'x' and store the result in 'y'?

y = myFunc(x)

myFunc(x) -> y

call myFunc(x) as y

y = call(myFunc, x)

Question 2

How do you capture two output arguments from a function, such as 'max'?

[val, idx] = max(v)

val, idx = max(v)

(val, idx) = max(v)

{val, idx} = max(v)

Question 3

Which command displays a brief summary of a function's usage directly in the Command Window?

help functionName

doc functionName

info functionName

man functionName

Question 4

What does the command 'doc plot' do?

Opens the Help Browser with detailed documentation for 'plot'

Prints a short text summary in the console

Plots a document icon

Creates a new documentation file

Question 5

How do you define an anonymous function that squares its input?

sqr = @(x) x.^2;

sqr = function(x) { return x^2; }

sqr(x) = x^2;

def sqr(x): return x^2

Question 6

Which of the following is a valid name for a user-defined function?

calculate_area

2calculate

calculate-area

calculate area

Question 7

If a function returns two values but you only want the second one, how can you ignore the first?

[~, result] = func()

[_, result] = func()

[0, result] = func()

[, result] = func()

Question 8

What happens if you call a function with fewer inputs than it expects (and it doesn't handle defaults)?

It throws an error: 'Not enough input arguments'

It assumes the missing inputs are 0

It prompts the user to enter them

It runs with 'NaN' for missing inputs

Question 9

What is the data type of 'f' in 'f = @(x) x+1'?

function_handle

string

double

object

Question 10

Can an anonymous function contain multiple statements or loops?

No, it must be a single executable expression

Yes, if separated by semicolons

Yes, if enclosed in braces

Only if it uses 'if' statements

Question 11

Which built-in variable inside a function tells you how many input arguments were passed?

nargin

ninput

args.length

count

Question 12

How do you call a function that requires no inputs?

funcName() or just funcName

funcName[]

call funcName

@funcName

Question 13

What is the maximum length of a function name in MATLAB?

63 characters

31 characters

255 characters

Unlimited

Question 14

If you have a function handle 'h', how do you evaluate it with input 5?

h(5)

eval(h, 5)

run(h, 5)

h.execute(5)

Question 15

Which command lists all functions in the current folder?

what

list

funcs

show

Question 16

Can you define a function inside a script file?

Yes, but it must be at the end of the file (Local Function)

No, functions must be in their own files

Yes, anywhere in the file

Only if the script is empty

Question 17

What is the purpose of 'varargin' in a function definition?

To accept a variable number of input arguments

To define a variable globally

To validate arguments

To return variable arguments

Question 18

Which function allows you to find the path of a built-in function file?

which functionName

where functionName

path functionName

find functionName

Question 19

What is the scope of variables defined inside a standard function?

Local to that function (they disappear after execution)

Global (accessible everywhere)

Persistent (saved between calls)

Shared with the base workspace

Question 20

How do you create an anonymous function with two inputs, x and y?

f = @(x, y) x + y;

f = @(x; y) x + y;

f = @(x) @(y) x + y;

f = (x, y) => x + y;

Question 21

What does 'lookfor keyword' do?

Searches the first comment line of all functions for the keyword

Searches the internet for the keyword

Finds a variable in the workspace

Looks for a file named keyword

Question 22

Which symbol is used to separate multiple output arguments in a function definition?

Commas: function [a, b] = myFunc()

Semicolons: function [a; b] = myFunc()

Spaces: function [a b] = myFunc()

Colons: function [a: b] = myFunc()

Question 23

If you define 'a = 5' in the Command Window, can an anonymous function 'f = @(x) x + a' use 'a'?

Yes, it captures the value of 'a' at the time of creation

No, anonymous functions have no scope

Yes, but it updates if 'a' changes later

Only if 'a' is global

Question 24

What is the primary difference between a Script and a Function?

Scripts share the base workspace; Functions have their own local workspace

Scripts are faster

Functions cannot save files

Scripts must start with the keyword 'script'

Question 25

Which naming convention is most commonly recommended for standard MATLAB functions?

camelCase or lowercase

Snake_Case

PascalCase

UPPERCASE

Question 26

What does the 'disp' function do?

Displays the value of a variable or string to the console

Disposes of a variable

Displays a graph

Disables warnings

Question 27

How can you pass a function as an argument to another function (e.g., to 'fplot')?

Pass the function handle: @sin

Pass the name as a string: 'sin'

Pass the result: sin(x)

Both A and B (depending on the function)

Question 28

What does 'nargout' allow you to do?

Check how many outputs the caller requested and adjust behavior

Set the number of outputs

Count input arguments

Output to a file

Question 29

Which keyword starts a function definition in a file?

function

def

func

define

Question 30

What is the result of 'feval(@sin, pi/2)'?

Error

pi/2

Question 31

Can a function name contain a period (e.g., 'my.func')?

No, periods are for struct fields or object methods

Yes, it's valid

Only if it's a package

Yes, if inside quotes

Question 32

What does the 'input' function do?

Prompts the user for input from the command line

Reads a file

Defines an input argument

Imports data

Question 33

If you want to create a function that accepts any number of inputs and returns their sum, which tool is essential?

varargin

inputParser

nargin

global

Question 34

What is a 'local function'?

A helper function defined in the same file as the main function, only accessible within that file

A function that only runs on the local machine

A function inside a loop

A variable named 'local'

Question 35

How do you access the documentation for a specific operator, like the colon operator?

help colon

help :

doc :

All of the above work

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Matlab Functions Quiz

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Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

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Question 19

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Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35

About This Functions Quiz

What You Will Practise

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Relational & Logical Operations

Arrays vs. Matrices