Matrix creation in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

beginner

How do you create a 3x3 matrix with all elements equal to zero in MATLAB?

Use the zeros(3,3) function. It creates a 3-by-3 matrix filled with zeros.

beginner

What MATLAB function creates a 4x4 identity matrix?

Use eye(4). It creates a 4-by-4 matrix with ones on the diagonal and zeros elsewhere.

intermediate

How can you create a matrix with values from 1 to 9 arranged in 3 rows and 3 columns?

Use reshape(1:9, 3, 3). It reshapes the vector 1 to 9 into a 3x3 matrix.

beginner

What does the MATLAB command rand(2,3) do?

It creates a 2-by-3 matrix with random values between 0 and 1.

intermediate

How do you create a matrix filled with the number 7 of size 2x4 in MATLAB?

Use 7 * ones(2,4). The ones function creates a matrix of ones, then multiply by 7.

Which MATLAB function creates a matrix with all elements equal to one?

A ones()

B zeros()

C eye()

D rand()

The ones() function creates a matrix filled with ones.

What is the size of the matrix created by zeros(5,2)?

A 5 rows and 2 columns

B 2 rows and 5 columns

C 5 rows and 5 columns

D 2 rows and 2 columns

zeros(5,2) creates a matrix with 5 rows and 2 columns.

What does eye(3) produce?

A 3x3 matrix of ones

B 3x3 zero matrix

C 3x3 identity matrix

D 3x3 random matrix

eye(3) creates a 3x3 identity matrix with ones on the diagonal.

How do you create a 2x3 matrix with random numbers between 0 and 1?

A ones(2,3)

B rand(2,3)

C zeros(2,3)

D eye(2,3)

rand(2,3) creates a 2x3 matrix with random values between 0 and 1.

Which command reshapes a vector into a matrix?

A rand()

B zeros()

C eye()

D reshape()

The reshape() function changes the shape of a vector or matrix.

Explain how to create a matrix of any size filled with a specific number in MATLAB.

Think about starting with a matrix of ones.

Describe the difference between zeros(), ones(), and eye() functions in MATLAB.

Focus on what each function fills the matrix with.