Why string operations are essential in MATLAB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a string variable named greeting.

MATLAB

greeting = [1];

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

AHello, world!

B'Hello, world!'

Chello world

D"Hello, world!"

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes instead of single quotes for strings in MATLAB.

In MATLAB, strings can be created using single quotes. So 'Hello, world!' is the correct way.

2fill in blank

medium

Complete the code to concatenate two strings str1 and str2.

MATLAB

result = [[1], str2];

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

A'str1'

Bstr2

C'str2'

Dstr1

Attempts:

3 left

💡 Hint

Common Mistakes

Putting variable names inside quotes, which makes them literal strings.

In MATLAB, square brackets concatenate strings or arrays. We want to concatenate str1 and str2, so use str1 inside the brackets.

3fill in blank

hard

Fix the error in the code to convert a string to uppercase.

MATLAB

upperStr = [1](inputStr);

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

Aupper

Buppercase

Ctoupper

Dlower

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent functions like 'uppercase' or 'toupper'.

The MATLAB function to convert strings to uppercase is upper.

4fill in blank

hard

Fill both blanks to extract a substring from str starting at position 2 with length 4.

MATLAB

subStr = [1](str, [2], 5);

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

AextractBetween

BextractBefore

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong function names or incorrect start position.

The function extractBetween extracts a substring from the start position to the end position (inclusive). Here, use start=2 and end=5 to get length 4.

5fill in blank

hard

Fill all three blanks to create a string array with words longer than 3 characters from the list.

MATLAB

filtered = words( [1](words) [2] [3] );

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

Astrlength

B>

C3

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using length instead of strlength, or Python-like list comprehension syntax.

To filter, use logical indexing: words(strlength(words) > 3). So we use strlength, the operator >, and the number 3.