R Programming Questions and Answers – R Profiler – 2

This set of R Programming Questions for campus interviews focuses on “R Profiler – 2”.

1. The profiler can be turned off by passing _________ to Rprof().
a) 0
b) 1
c) 2
d) NULL
View Answer

2. Point out the correct statement?
a) Rprof() is used to turn off the profiler
b) At each line of the output, the profiler writes out the function call stack
c) The summaryprof() function tabulates the R profiler output
d) The Rprofiler() function starts the profiler in R
View Answer

3. How many methods exist for normalizing the data?
a) one
b) two
c) three
d) profiler
View Answer

4. _______ divides the time spend in each function by the total run time
a) “by.sum”
b) “by.total”
c) “by.self”
d) “by.del”
View Answer

5. Point out the correct statement?
a) “by.total” first subtracts out time spent in functions above the current function in the call stack
b) The summaryRprof() function calculates how much time is spend in which function
c) By default, the profiler samples the function call stack every 0.02 seconds
d) The Rprofiler() function starts the profiler in R
View Answer

6. Which of the following function actually fits the linear model?
a) lm.time()
b) lm.date()
c) lm.fit()
d) lm.interval()
View Answer

7. The final bit of output that summaryRprof() provides is the ______ interval and the total runtime.
a) response
b) sampling
c) processing
d) retrieve
View Answer

8. Which of the following statement gives sampling interval?
a) $sampling.interval
b) $sampling.time
c) $sampling.date
d) $sampling.datetime
View Answer

9. Which of the following code is not profiled?
a) C
b) C++
c) Java
d) PHP
View Answer

Sanfoundry Global Education & Learning Series – R Programming Language.

Here’s the list of Best Reference Books in R Programming Language.