MCQs R Debugging 6

1. Which of the following functions initiates an interactive debugging environment that allows you to step through code one expression at a time?

stop( )

tryCatch( )

try( )

browser( )

2. What does the profvis( ) function do?

Displays profiling information in an interactive visualization in RStudio

Visualizes code that runs quickly (in less than 10 milliseconds)

Prints debugging information to the console

Writes a log file of the function call stack

3. What does calling trace(“f”) for function “f( )” do

Whenever f( ) is called, it will enter the interactive debugger.

Whenever f( ) is called, the function call stack is written to a file.

Whenever f( ) is called, a message is printed to the console indicating that the function was called.

It generates a log file containing debugging information.

4. When should the traceback( ) function be called?

Immediately after a warning occurs

Any time after an error occurs

Only while debugging inside a function

Immediately after an error occurs

5. What does the Rprof( ) function do?

Re-formats your code to adhere to standards

Analyzes your code for potential bugs

Visualizes the time behavior of R code

Writes out the function call stack at user-specified intervals of time

6. Which function is better for analyzing fast-running functions: profvis( ) or microbenchmark( )?

microbenchmark( )

profvis( )

Both profvis( ) and microbenchmark( )

None of profvis( ) and microbenchmark( )

7. What is the microbenchmark package useful for?

Modifying code in other developers’ packages

Comparing the speed of several functions that do the same thing

Interactively debugging functions

Handling warnings and errors in non-standard ways

8. What does the traceback( ) function do?

Returns the state of the function call stack just before an occurred

Pauses execution of a function

Sets the debugging flag for a function

Evaluates an expression and returns on the object of “try-error” if an error occurs

9. Which of the following functions allows you to temporarily insert pieces of code into other functions to modify their behavior?

recover( )

browser( )

trace( )

debug( )

10. Debugging is the process of

Handling errors in a nonstandard manner

Getting your expectations about code behavior to converge with reality

Writing code that uses memory efficiently

Writing code that is as fast as possible

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