Inline R code in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the value of x inline.

R Programming

x <- 5
cat("The value of x is ", [1], "\n")

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

Ax

B"x"

Cprint(x)

Dvalue(x)

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around x prints the letter 'x' instead of its value.

Using print(x) inside cat() will not work as expected.

The variable x holds the value 5, so using x inline prints its value.

2fill in blank

medium

Complete the code to embed the result of 3 + 4 inline in the string.

R Programming

cat(sprintf("3 + 4 equals %d\n", [1]))

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

A"3 + 4"

Bsum(3, 4)

C3 + 4

D"7"

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the expression inside quotes prints it literally.

Using sum(3, 4) is valid but not the simplest inline expression here.

Using 3 + 4 inside sprintf evaluates the expression and inserts the result.

3fill in blank

hard

Fix the error in the code to correctly embed the variable y inline.

R Programming

y <- 10
cat(paste0("Value of y is ", [1]))

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

Aas.character(y)

By

Cprint(y)

D"y"

Attempts:

3 left

💡 Hint

Common Mistakes

Using "y" prints the letter 'y' instead of its value.

Using print(y) returns NULL inside paste0.

Using as.character(y) converts the number to a string so it can be concatenated inside paste0.

4fill in blank

hard

Fill both blanks to create a named list with word lengths greater than 3.

R Programming

words <- c("cat", "house", "dog", "elephant")
lengths <- list()
for (word in words) {
  if (nchar(word) [1] 3) {
    lengths[[word]] <- [2]
  }
}

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

A>

Bnchar(word)

C<

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

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

Storing the word instead of its length.

The condition checks if the word length is greater than 3, and then stores the length using nchar(word).

5fill in blank

hard

Fill all three blanks to create a named vector with uppercase keys and values for words longer than 4.

R Programming

words <- c("apple", "bat", "carrot", "dog")
result <- c()
for (w in words) {
  if (nchar(w) [1] 4) {
    result[[2]] <- [3]
  }
}

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

A>

Btoupper(w)

Cw

Dtolower(w)

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' reverses the condition.

Using lowercase for keys instead of uppercase.

Assigning the key and value incorrectly.

The condition checks if the word length is greater than 4. The key is the uppercase word using toupper(w), and the value is the original word w.