Special matrices (zeros, ones, eye, rand) in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a 3x3 matrix of zeros.

MATLAB

A = [1](3, 3);

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

Arand

Bones

Czeros

Deye

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ones' instead of 'zeros' will create a matrix filled with ones.

Using 'eye' creates an identity matrix, not zeros.

The zeros function creates a matrix filled with zeros. Here, zeros(3, 3) creates a 3x3 matrix of zeros.

2fill in blank

medium

Complete the code to create a 4x4 identity matrix.

MATLAB

I = [1](4);

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

Aones

Beye

Czeros

Drand

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ones' creates a matrix full of ones, not an identity matrix.

Using 'zeros' creates a matrix full of zeros.

The eye function creates an identity matrix. eye(4) creates a 4x4 identity matrix with ones on the diagonal and zeros elsewhere.

3fill in blank

hard

Fix the error in the code to create a 2x5 matrix of random numbers between 0 and 1.

MATLAB

R = [1](2, 5);

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

Arand

Beye

Czeros

Dones

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ones' or 'zeros' creates matrices with fixed values, not random.

Using 'eye' creates an identity matrix, which is square and not random.

The rand function creates a matrix of random numbers between 0 and 1. rand(2, 5) creates a 2x5 matrix with random values.

4fill in blank

hard

Fill both blanks to create a 5x5 matrix of ones and then replace the diagonal with zeros.

MATLAB

M = [1](5);
M([2]) = 0;

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

Aones

Beye

C1:6:numel(M)

Dzeros

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'eye' instead of 'ones' creates an identity matrix, not a matrix of ones.

Using 'zeros' to create the matrix will not fill it with ones first.

First, ones(5) creates a 5x5 matrix filled with ones. Then, 1:6:numel(M) selects the diagonal elements of the matrix M. Setting these to zero replaces the diagonal with zeros.

5fill in blank

hard

Fill all three blanks to create a 3x4 matrix of random numbers, then create a 4x4 identity matrix, and finally a 2x2 matrix of zeros.

MATLAB

A = [1](3, 4);
B = [2](4);
C = [3](2, 2);

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

Arand

Beye

Czeros

Dones

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the functions and their sizes.

Using 'ones' instead of 'zeros' for the last matrix.

rand(3, 4) creates a 3x4 matrix with random numbers. eye(4) creates a 4x4 identity matrix. zeros(2, 2) creates a 2x2 matrix filled with zeros.