MCQs R Debugging 6

1. What is the microbenchmark package useful for?

Handling warnings and errors in non-standard ways

Comparing the speed of several functions that do the same thing

Interactively debugging functions

Modifying code in other developers’ packages

2. What does the profvis( ) function do?

Prints debugging information to the console

Displays profiling information in an interactive visualization in RStudio

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

Writes a log file of the function call stack

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

recover( )

debug( )

browser( )

trace( )

4. Debugging is the process of

Writing code that is as fast as possible

Handling errors in a nonstandard manner

Getting your expectations about code behavior to converge with reality

Writing code that uses memory efficiently

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

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.

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

It generates a log file containing debugging information.

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

None of profvis( ) and microbenchmark( )

profvis( )

microbenchmark( )

Both profvis( ) and microbenchmark( )

7. What does the traceback( ) function do?

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

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

Pauses execution of a function

Sets the debugging flag for a function

8. What does the Rprof( ) function do?

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

Analyzes your code for potential bugs

Visualizes the time behavior of R code

Re-formats your code to adhere to standards

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

Immediately after a warning occurs

Only while debugging inside a function

Any time after an error occurs

Immediately after an error occurs

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

browser( )

stop( )

tryCatch( )

try( )

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