Debugging tools in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the current call stack.

R Programming

[1]()

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

Atraceback

Btraceback_print

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function name that does not exist in the traceback package.

Trying to print the call stack without calling the correct function.

The traceback() function prints the current call stack in R, helping you see the sequence of function calls.

2fill in blank

medium

Complete the code to start debugging a function call.

R Programming

debug([1])

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

Amy_function

Bprint

Csummary

Dplot

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a function call instead of a function name.

Using a built-in function that is not the target for debugging.

The debug() function in R sets a breakpoint on the specified function, here my_function, so you can step through it.

3fill in blank

hard

Fix the error in the code to stop debugging the function.

R Programming

undebug([1])

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

Amy_function()

Bstop

Cdebug

Dmy_function

Attempts:

3 left

💡 Hint

Common Mistakes

Including parentheses when passing the function name.

Passing a string instead of the function object.

The undebug() function requires the function name without parentheses to stop debugging it.

4fill in blank

hard

Fill both blanks to print the last error message and then clear it.

R Programming

print([1]())
[2]()

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

Alast_error

Cgeterrmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent function like last_error.

Not calling the function to clear the error message.

geterrmessage() prints the last error message, and calling it again resets the error message in R.

5fill in blank

hard

Fill all three blanks to run code with error handling and print a custom message.

R Programming

tryCatch([1]("a"), error = function(e) {
  print(paste('Error:', [2]))
  [3]()
})

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

Alog

Be$message

Cstop

Dmean

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function that does not cause errors for demonstration.

Not accessing the error message correctly.

Not stopping execution after printing the error.

tryCatch() runs log("a"). If an error occurs, it prints the error message e$message and then stops execution with stop().