String replacement in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace all occurrences of 'cat' with 'dog' in the string.

MATLAB

str = 'The cat sat on the mat.';
newStr = strrep(str, 'cat', [1]);

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

A'dog'

B'rat'

C'bat'

D'cow'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the replacement string.

Using the wrong function for replacement.

The strrep function replaces all occurrences of the second argument with the third argument in the string.

2fill in blank

medium

Complete the code to replace all spaces with underscores in the string.

MATLAB

text = 'hello world example';
result = strrep(text, [1], '_');

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

A'-'

B' '

C'_'

D','

Attempts:

3 left

💡 Hint

Common Mistakes

Using '_' as the substring to replace instead of the replacement.

Forgetting to use quotes around the space.

To replace spaces, you specify the space character ' ' as the substring to replace.

3fill in blank

hard

Fix the error in the code to replace 'apple' with 'orange' in the string.

MATLAB

fruit = 'apple pie';
newFruit = strrep(fruit, 'apple', [1]);

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A'orange'

Borange

C'apple'

Dorange'

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the replacement string.

Using double quotes instead of single quotes.

The replacement string must be enclosed in single quotes to be recognized as a string.

4fill in blank

hard

Fill both blanks to replace 'dog' with 'cat' and 'mouse' with 'rat' in the string.

MATLAB

sentence = 'The dog chased the mouse.';
step1 = strrep(sentence, [1], 'cat');
result = strrep(step1, [2], 'rat');

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

A'dog'

B'cat'

C'mouse'

D'rat'

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of replacements.

Replacing the wrong substrings.

First replace 'dog' with 'cat', then replace 'mouse' with 'rat' using strrep.

5fill in blank

hard

Fill all three blanks to create a dictionary of words and their lengths, but only include words longer than 3 letters.

MATLAB

words = {'cat', 'elephant', 'dog', 'mouse'};
lengths = containers.Map();
for i = 1:length(words)
    word = words{i};
    if length(word) [1] 3
        lengths([2]) = [3];
    end
end

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

A>

Bword

Clength(word)

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' in the condition.

Using the length as the key instead of the word.

We check if the word length is greater than 3, then add the word as key and its length as value to the map.