Debugging tools in R Programming - Mini Project: Build & Apply

Debugging Tools in R

📖 Scenario: You are working on a small R script that calculates the average of a list of numbers. Sometimes, the script gives unexpected results or errors. To fix this, you want to learn how to use basic debugging tools in R.

🎯 Goal: Learn how to use simple debugging tools in R like print() statements and the browser() function to find and fix errors in your code.

📋 What You'll Learn

Create a numeric vector called numbers with specific values

Create a variable called threshold to use in a condition

Write a for loop to calculate the sum of numbers greater than the threshold

Use print() and browser() to debug the loop

Print the final sum

💡 Why This Matters

🌍 Real World

Debugging is a key skill when writing any program. Using print statements and breakpoints helps find where things go wrong.

💼 Career

Many programming jobs require you to debug code efficiently. Knowing how to pause and inspect your program helps fix bugs faster.

1

Create the data vector

Create a numeric vector called numbers with these exact values: 5, 12, 7, 20, 3.

R Programming

# Create the numeric vector numbers with values 5, 12, 7, 20, 3
# Your code here

Need a hint?

Use the c() function to create a vector with the given numbers.

2

Set the threshold value

Create a variable called threshold and set it to the number 10.

R Programming

numbers <- c(5, 12, 7, 20, 3)
# Create the variable threshold and set it to 10
# Your code here

Need a hint?

Just assign the number 10 to the variable threshold.

3

Calculate sum with debugging

Write a for loop using the variable num to go through each element in numbers. Inside the loop, use print(num) to show the current number, then use if to check if num is greater than threshold. If yes, add num to a variable called total. Use browser() inside the if block to pause execution for debugging. Initialize total to 0 before the loop.

R Programming

numbers  threshold
# Use browser() inside the if block
# Add num to total if condition is true
# Your code here

Need a hint?

Remember to initialize total before the loop. Use for (num in numbers) to loop. Use print(num) to see each number. Use browser() inside the if block to pause.

4

Print the final sum

Write a print() statement to display the value of total after the loop.

R Programming

numbers  threshold) {
    browser()
    total <- total + num
  }
}
# Print the total
# Your code here

Need a hint?

Use print(total) to show the final sum.