Special operators (%in%, %*%) in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if 3 is in the vector.

R Programming

3 [1] c(1, 2, 3, 4, 5)

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

A%in%

B%*%

C%/%

D%%

Attempts:

3 left

💡 Hint

Common Mistakes

Using %*% which is for matrix multiplication.

Using %% which is for modulo operation.

The %in% operator checks if the left value is present in the right vector.

2fill in blank

medium

Complete the code to multiply two matrices A and B.

R Programming

result <- A [1] B

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

A%in%

B%%

C%*%

D%/%

Attempts:

3 left

💡 Hint

Common Mistakes

Using %in% which checks membership, not multiplication.

Using %% which is modulo, not multiplication.

The %*% operator performs matrix multiplication in R.

3fill in blank

hard

Fix the error in the code to check if 'apple' is in the fruits vector.

R Programming

'apple' [1] fruits

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A%*%

Bis.in

Cin

D%in%

Attempts:

3 left

💡 Hint

Common Mistakes

Using %*% which is matrix multiplication.

Using 'in' without percent signs which is not valid syntax.

The correct operator to check membership is %in%. Other options are invalid in R.

4fill in blank

hard

Fill both blanks to create a named vector with lengths of words longer than 3 characters.

R Programming

lengths <- c([1] = [2] for word in words if nchar(word) > 3)

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Aword

Bnchar(word)

Clength(word)

Dcount(word)

Attempts:

3 left

💡 Hint

Common Mistakes

Using length(word) which returns 1 for strings.

Using count(word) which is not a base R function.

The names of the vector elements should be the words themselves, and the values should be their character counts using nchar().

5fill in blank

hard

Fill all three blanks to create a named vector of word lengths for words longer than 4 characters.

R Programming

word_lengths <- c([1] = [2] for word in words if nchar(word) [3] 4)

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

Aword

Bnchar(word)

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

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

Using length(word) instead of nchar(word).

The vector names are the words, values are their lengths using nchar(), and the condition checks if length is greater than 4.