MATLAB Quiz on Matrices and Loops

What is a matrix in MATLAB?

• 1D array

• A loop

• 2D array of numbers

• A string

• A cell

What does randi(20, 4, 4) create?

• Random 4-element row

• A 4x4 matrix of 0s

• Random 4x4 matrix with integers from 1 to 20

• Identity matrix

• Transposed matrix

What is the result of A .* B?

• Matrix multiplication

• Addition

• Element-wise multiplication

• Determinant

• Transpose

What does A' do in MATLAB?

• Deletes A

• Copies A

• Transposes A

• Squares A

• Multiplies A by 2

Which symbol is used for matrix multiplication?

• .*

• .^

• +

• *

• //

What function finds the determinant?

• mean(A)

• sum(A)

• det(A)

• inv(A)

• rank(A)

What is the output of A(2,3) for A = [1 2 3; 4 5 6]?

• 3

• 4

• 6

• 2

• Error

How do you access the second row in matrix A?

• A(:,2)

• A(2,:)

• A(2,2)

• A(2)

• row(A,2)

What does inv(A) return?

• Transpose

• Inverse matrix

• Identity matrix

• Scalar

• Error

Which of these is a valid row vector?

• [1; 2; 3]

• [1, 2, 3]

• 1:3:10

• [1 2; 3 4]

• '123'