Nested loops in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a nested loop that prints numbers 1 to 3 for both loops.

MATLAB

for i = 1:3
    for j = 1:[1]
        disp([i, j])
    end
end

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

A4

B2

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different range for the inner loop causing fewer or more iterations.

The inner loop must run from 1 to 3 to match the outer loop and print pairs from 1 to 3.

2fill in blank

medium

Complete the code to sum all elements in a 2D matrix using nested loops.

MATLAB

total = 0;
for row = 1:size(matrix, 1)
    for col = 1:size(matrix, [1])
        total = total + matrix(row, col);
    end
end

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A4

B1

C3

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using size(matrix, 1) for columns which is actually rows.

The second dimension of the matrix is the number of columns, which is size(matrix, 2).

3fill in blank

hard

Fix the error in the nested loops that print the multiplication table from 1 to 5.

MATLAB

for i = 1:5
    for j = 1:[1]
        fprintf('%d x %d = %d\n', i, j, i*j);
    end
end

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A5

B3

C6

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using a smaller range in the inner loop causing incomplete output.

The inner loop must run from 1 to 5 to complete the multiplication table for numbers 1 to 5.

4fill in blank

hard

Fill both blanks to create a nested loop that fills a matrix with the product of its indices.

MATLAB

rows = 3;
cols = 4;
result = zeros(rows, cols);
for r = 1:[1]
    for c = 1:[2]
        result(r, c) = r * c;
    end
end

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Arows

Bcols

C4

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping rows and columns in the loops.

The outer loop runs over rows, the inner loop over columns to fill the matrix correctly.

5fill in blank

hard

Fill all three blanks to create a nested loop that counts how many elements in a matrix are greater than 10.

MATLAB

count = 0;
for i = 1:[1]
    for j = 1:[2]
        if matrix(i, j) [3] 10
            count = count + 1;
        end
    end
end

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Asize(matrix, 1)

Bsize(matrix, 2)

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong size dimensions or wrong comparison operator.

The loops iterate over all rows and columns. The condition checks if elements are greater than 10.