PHP interview questions part 33
PHP interview questions part 33
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. The elapsed time may be ________ than the user time if your machine has multiple cores/processors
Correct Answer is : Error
2. Parallel processing is done via __________ package can make the elapsed time smaller than the user time.
Correct Answer is : Error
3. You can time ________ expressions by wrapping them in curly braces within the call to system.time().
Correct Answer is : Error
4. The profiler can be turned off by passing _________ to Rprof().
Correct Answer is : Hello World
5. How many methods exist for normalizing the data ?
Correct Answer is : Nothing
6. _______ divides the time spend in each function by the total run time
Correct Answer is : 1010
7. Which of the following function actually fits the linear model ?
Correct Answer is : 5
8. The final bit of output that summaryRprof() provides is the ______ interval and the total runtime.
Correct Answer is : Nothing
9. Which of the following statement gives sampling interval ?
Correct Answer is : 105
10. Which of the following code is not profiled ?
Correct Answer is : 439
11. The ________ function takes an arbitrary number of arguments and concatenates them one by one into character strings.
Correct Answer is : 437
12. What would be the result of following code ? > x <- 1:3 > y <- 10:12 > rbind(x, y)
Correct Answer is : 9
13. What would the following code print ? > x <- list(1, "a", TRUE, 1 + 4i) > x
Correct Answer is : Error
14. Which of the following is valid assignment?
Correct Answer is : 1400
15. What would be the output of the following code ? > x <- vector("list", length = 5) > x
Correct Answer is : /
16. What would be the output of the following code ? > x <- factor(c("yes", "yes", "no", "yes", "no")) > table(x)
Correct Answer is : $looser
17. Which of the following code snippet will create a vector with NAs in it ?
Correct Answer is : \
18. .What would the following code print ? > x <- c(1, 2, NaN, NA, 4) > is.na(x)
Correct Answer is : 15
19. Which of the following would print the following output ? foo bar 1 1 TRUE 2 2 TRUE 3 3 FALSE 4 4 FALSE
Correct Answer is : 10
20. Data frames can be converted to a matrix by calling data._______
Correct Answer is : 0
