Reshaping arrays in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to reshape the vector into a 2x3 matrix.

MATLAB

A = 1:6;
B = reshape(A, [1]);

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

A[2, 3]

B[3, 2]

C[6, 1]

D[1, 6]

Attempts:

3 left

💡 Hint

Common Mistakes

Using dimensions that do not multiply to the total number of elements.

Swapping rows and columns.

The reshape function changes the shape of the array. Here, we want a 2 rows and 3 columns matrix, so use [2, 3].

2fill in blank

medium

Complete the code to reshape matrix M into a column vector.

MATLAB

M = [1 2 3; 4 5 6];
V = reshape(M, [1]);

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

A[6, 1]

B[3, 2]

C[1, 6]

D[2, 3]

Attempts:

3 left

💡 Hint

Common Mistakes

Using [1, 6] which creates a row vector instead.

Confusing rows and columns.

To reshape M into a column vector, it must have 6 rows and 1 column, so use [6, 1].

3fill in blank

hard

Fix the error in reshaping matrix X into a 3x3 matrix.

MATLAB

X = 1:8;
Y = reshape(X, [1]);

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

A[3, 3]

B[2, 4]

C[1, 8]

D[4, 2]

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to reshape into a size that does not match the number of elements.

Ignoring the error message from MATLAB.

The vector X has 8 elements, so it cannot be reshaped into a 3x3 matrix (which needs 9 elements). Using [1, 8] keeps it as a row vector.

4fill in blank

hard

Fill both blanks to reshape vector V into a 4x2 matrix and then back to a 2x4 matrix.

MATLAB

V = 1:8;
M1 = reshape(V, [1]);
M2 = reshape(M1, [2]);

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

A[4, 2]

B[2, 4]

C[8, 1]

D[1, 8]

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of rows and columns.

Using incompatible dimensions that don't match the number of elements.

First reshape V into 4 rows and 2 columns, then reshape M1 into 2 rows and 4 columns.

5fill in blank

hard

Fill all three blanks to create a 3D array from vector W and then reshape it back to a 2D matrix.

MATLAB

W = 1:12;
A = reshape(W, [1], [2], [3]);
B = reshape(A, [4, 3]);

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

A2

B3

D6

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing dimensions that do not multiply to 12.

Confusing the order of dimensions.

The vector W has 12 elements. Reshape it into a 3D array with dimensions 2x3x2 (2*3*2=12). Then reshape back to a 4x3 matrix.