R interview questions part 7
R interview questions part 7
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. Point out the correct statement :
Correct Answer is : There are two statements that can be used to explicitly control looping
2. What will be the output of the following code? > centre <- function(x, type) { + switch(type, + mean = mean(x), + median = median(x), + trimmed = mean(x, trim = .1)) + } > x <- rcauchy(10) > centre(x, "mean")
Correct Answer is : gives mean with values depending on rcauchy values
3. R has ________ basic indexing operators.
Correct Answer is : three
4. R has how many atomic classes of objects ?
Correct Answer is : 5
5. Point out the correct statement :
Correct Answer is : Empty vectors can be created with the vector() function
6. Numbers in R are generally treated as _______ precision real numbers.
Correct Answer is : double
7. If you explicitly want an integer, you need to specify the _____ suffix.
Correct Answer is : L
8. Point out the correct statement :
Correct Answer is : Number Inf represents infinity in R
9. Attributes of an object (if any) can be accessed using the ______ function.
Correct Answer is : attributes()
10. R objects can have attributes, which are like ________ for the object.
Correct Answer is : metadata
11. Which of the following can be considered as object attribute ?
Correct Answer is : all of the mentioned
12. What would be the result of following code ? > x <- vector("numeric", length = 10) > x
Correct Answer is : 0 0 0 0 0 0 0 0 0 0
13. The ___ function can be used to create vectors of objects by concatenating things together.
Correct Answer is : c()
14. Which of the following statement is invalid ?
Correct Answer is : None of the mentioned
15. Point out the correct statement :
Correct Answer is : All of the mentioned
16. What would be the result of following code ? > x <- 6 > class(x)
Correct Answer is : “numeric”
17. What will the following code print ? > x <- 0:6 > as.logical(x)
Correct Answer is : FALSE TRUE TRUE TRUE TRUE TRUE TRUE
18. Point out the correct statement :
Correct Answer is : Vectors can be used in arithmetic expressions, in which case the operations are performed element by element
19. What would be the output of the following code ? > sqrt(-17)
Correct Answer is :
20. _______ function returns a vector of the same size as x with the elements arranged in increasing order
Correct Answer is : sort()
