R interview questions part 17
R interview questions part 17
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Total Questions: 20
1. In the base graphics system, which function is used to add elements to a plot?
Correct Answer is : Boxplot() or Text()
2. What are the different types of sorting algorithms available in R language?
Correct Answer is : All sorts
3. What is the command used to store R objects in a file?
Correct Answer is : save (x, file=”x.Rdata”)
4. ___________ can be used for storing the data for long-term.
Correct Answer is : HDFS
5. MapReduce jobs submitted from either Oozie, Pig or Hive can be used to encode, improve and sample the data sets from _________ into R.
Correct Answer is : HDFS
6. What will be the output of log (-5.8) when executed on R console?
Correct Answer is : NAN
7. How is a Data object represented internally in R language?
Correct Answer is : unclass (as.Date (“2018-12-28″))
8. Which package in R supports the exploratory analysis of genomic data?
Correct Answer is : Adegenet
9. __________ can contain heterogeneous inputs.
Correct Answer is : Data Frames
10. ________ function can be used to add datasets in R provided with the columns in the datasets should be the same.
Correct Answer is : rbind()
11. _________ variables are categorical variables which can hold either string or numeric values.
Correct Answer is : Factor
12. What is the memory limit in R for 64 bit system?
Correct Answer is : 8 TB
13. What is the memory limit in R for 32 bit system?
Correct Answer is : 3GB
14. What are the data types in R on which binary operators can be applied?
Correct Answer is : Scalars, Matrices and Vectors
15. __________ function is used in applying a function each level of factors.
Correct Answer is : By()
16. How do you create log linear models in R language?
Correct Answer is : loglm()
17. What will be the class of the vector if you concatenate a number and NA?
Correct Answer is : Number
18. ____________ is one type of the simplest machine learning classification algorithms that is a subset of supervised learning based on lazy learning.
Correct Answer is : K-Nearest Neighbour
19. What will be the class of the vector if you concatenate a number and a character?
Correct Answer is : Character
20. R code can be tested using _________________ package.
Correct Answer is : Hadley’s testthat
