Why functions organize MATLAB code - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a simple function that adds two numbers.

MATLAB

function result = addNumbers(a, b)
    result = a [1] b;
end

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A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to use an operator.

The plus sign + adds two numbers in MATLAB.

2fill in blank

medium

Complete the code to call the function 'addNumbers' with inputs 3 and 5.

MATLAB

sum = [1](3, 5);

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AsumNumbers

BaddNumbers

Cadd

DsumAdd

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong or misspelled function name.

Confusing function name with variable names.

The function is named addNumbers, so calling it requires that exact name.

3fill in blank

hard

Fix the error in the function definition by completing the missing keyword.

MATLAB

[1] addNumbers(a, b)
    result = a + b;
end

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Afunction

Bdef

Cfunc

Dfun

Attempts:

3 left

💡 Hint

Common Mistakes

Using Python or other language keywords like def.

Omitting the keyword entirely.

In MATLAB, functions start with the keyword function.

4fill in blank

hard

Fill both blanks to create a function that returns the square of a number.

MATLAB

function [1] = squareNumber([2])
    [1] = [2]^2;
end

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Aresult

Bnum

Cvalue

Doutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for input and output variables.

Forgetting to use the power operator ^.

The function output variable is result and the input variable is num.

5fill in blank

hard

Fill all three blanks to create a function that checks if a number is positive.

MATLAB

function [1] = isPositive([2])
    if [2] [3] 0
        [1] = true;
    else
        [1] = false;
    end
end

Drag options to blanks, or click blank then click option'

Aresult

Bnum

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Mixing up input and output variable names.

The function returns result, takes input num, and checks if num > 0.