Error handling (tryCatch) in R Programming - Mini Project: Build & Apply

Error handling with tryCatch in R

📖 Scenario: Imagine you are writing a small R program that divides numbers. Sometimes, the divisor might be zero, which causes an error. You want to handle this error gracefully so your program doesn't stop unexpectedly.

🎯 Goal: You will create a program that divides two numbers and uses tryCatch to handle division by zero errors by showing a friendly message instead of stopping.

📋 What You'll Learn

Create two numeric variables named numerator and denominator with exact values

Create a variable named result to store the division result

Use tryCatch to catch division errors

Print the result or an error message

💡 Why This Matters

🌍 Real World

Handling errors like division by zero is important in data analysis and scientific computing to avoid program crashes.

💼 Career

Error handling is a key skill for data scientists and programmers to write robust and user-friendly code.

1

Create numerator and denominator variables

Create a numeric variable called numerator and set it to 10. Create another numeric variable called denominator and set it to 0.

R Programming

# Create numerator and denominator variables
# Your code here

Need a hint?

Use the assignment operator <- to create variables.

2

Create a result variable with default value

Create a variable called result and set it to NA to hold the division result before calculation.

R Programming

numerator <- 10
denominator <- 0
# Create a variable called result and set it to NA
# Your code here

Need a hint?

Use NA to represent a missing value in R.

3

Use tryCatch to perform division safely

Use tryCatch to divide numerator by denominator and assign the result to result. If an error occurs, assign the string "Error: Division by zero" to result.

R Programming

numerator <- 10
denominator <- 0
result <- NA
# Use tryCatch to divide numerator by denominator safely
# Your code here

Need a hint?

Inside tryCatch, put the division expression in the first argument, and define an error function that returns the error message string.

4

Print the result

Write a print statement to display the value of result.

R Programming

numerator <- 10
denominator <- 0
result <- NA
result <- tryCatch({
  numerator / denominator
}, error = function(e) {
  "Error: Division by zero"
})
# Print the result
# Your code here

Need a hint?

Use print(result) to show the output.