Matrix concatenation in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to concatenate two matrices A and B horizontally.

MATLAB

C = [A [1] B];

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

A.

B;

C,

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon instead of comma causes vertical concatenation.

Using dot or colon is invalid syntax here.

In MATLAB, horizontal concatenation uses a comma , or space between matrices.

2fill in blank

medium

Complete the code to concatenate two matrices A and B vertically.

MATLAB

C = [A [1] B];

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

A;

B,

C.

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using comma instead of semicolon causes horizontal concatenation.

Using dot or colon is invalid syntax here.

Vertical concatenation in MATLAB uses a semicolon ; between matrices inside square brackets.

3fill in blank

hard

Fix the error in the code to concatenate matrices A and B horizontally.

MATLAB

C = [A [1] B];

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

A:

B;

C.

D,

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon causes vertical concatenation, not horizontal.

Using dot or colon is invalid syntax.

Horizontal concatenation requires a comma or space between matrices inside square brackets.

4fill in blank

hard

Fill both blanks to create a 2x2 block matrix from A and B horizontally and vertically.

MATLAB

C = [[A [1] B]; [A [2] B]];

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

A,

B;

C.

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon inside rows causes vertical concatenation, breaking the block structure.

Using dot or colon is invalid syntax.

Use commas for horizontal concatenation inside each row, and semicolon to separate rows. Here, inside each row, horizontal concatenation uses commas.

5fill in blank

hard

Complete the code to create a block matrix with A and B arranged in a 2x2 grid.

MATLAB

C = [[A , B]; [B , A]]; sizeC = size(C, [1]);

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

A,

B;

C1

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon inside rows breaks horizontal concatenation.

Using 1 instead of 2 in size returns number of rows, not columns.

Use commas for horizontal concatenation inside rows, semicolon to separate rows, and size(C, 2) to get the number of columns.