Return values in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the sum of two numbers.

R Programming

add_numbers <- function(a, b) {
  return([1])
}

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Aa * b

Ba - b

Ca + b

Da / b

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction (-) instead of addition (+).

Forgetting to use return() to send back the result.

The function should return the sum of a and b. Using a + b correctly adds the two numbers.

2fill in blank

medium

Complete the code to return the first element of a vector.

R Programming

get_first <- function(vec) {
  return(vec[1])
}

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A[[2]]

B[1]

C[[1]]

D[2]

Attempts:

3 left

💡 Hint

Common Mistakes

Using double square brackets ([[1]]) which is for lists, not vectors.

Using index 2 instead of 1.

In R, to get the first element of a vector, use single square brackets with index 1: vec[1].

3fill in blank

hard

Fix the error in the function to return the length of a vector.

R Programming

vector_length <- function(x) {
  len <- length(x)
  return([1])
}

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Ax

Bx.length

Clength

Dlen

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the vector x instead of its length.

Trying to return length which is a function, not a variable.

The variable len stores the length of x. The function should return len.

4fill in blank

hard

Fill both blanks to return a named list with the vector and its mean.

R Programming

summary_stats <- function(data) {
  result <- list([1] = data, [2] = mean(data))
  return(result)
}

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Avalues

Baverage

Cmean

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for both list elements.

Using incorrect or unclear names.

The list should have names values for the data vector and average for its mean.

5fill in blank

hard

Fill all three blanks to return a list with the sum, product, and difference of two numbers.

R Programming

calculate <- function(x, y) {
  result <- list([1] = x + y, [2] = x * y, [3] = x - y)
  return(result)
}

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

Asum

Bproduct

Cdifference

Dtotal

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the names and operations.

Using generic names like total instead of specific ones.

The list should have names sum, product, and difference for the respective calculations.