R Programming Questions and Answers – Data Types – 3

This set of R Programming Questions and Answers for freshers focuses on “Data Types – 3”.

1. Which of the following statement would print “0” “1” “2” “3” “4” “5” “6” for the following R code?

 > x <- 0:6

a) as.character(x)
b) as.logical(x)
c) as.numeric(x)
d) as.num(y)
View Answer

2. Point out the correct statement?
a) rep() is be used for replicating an object in various complicated ways
b) seq() function has four arguments
c) sequence() is a more general facility for generating sequences
d) numerical vectors are generated by conditions
View Answer

3. What will be the output of the following R code?

x <- c("a", "b", "c")
> as.numeric(x)

a) Warning
b) Error
c) Abnormal termination
d) Prints x
View Answer

4. What will be the output of the following R code?

> x <- c("a", "b", "c")
> as.logical(x)

a) a b c
b) NA NA NA
c) 0 1 2
d) 6 8 9
View Answer

5. Point out the correct statement?
a) The elements of a logical vector cannot have the values TRUE, FALSE, and NA
b) Matrices are vectors with a dimension attribute
c) Numerical vectors are generated by conditions
d) seq() function has four arguments
View Answer

6. Which of the following is a valid assignment?
a)

 > m <- matrix(nrow = 2, ncol = 3)

b)

 > m <- matrix(nrow = 2, ncol = 3.5)

c)

 > m <- mat(nrow = 2, ncol = 3)

d)

 > m <- mat(nrow = 2, ncol = 5)

7. What will be the output of the following R code?

 > m <- matrix(nrow = 2, ncol = 3)
 > dim(m)

a) 3 2
b) 2 3
c) 2 2
d) 4 5
View Answer

8. What will be the output of the following R code?

> m <- matrix(1:6, nrow = 2, ncol = 3)
> m

a)

[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6

b)

[,0] [,1] [,2]
[1,] 1 3 5
[2,] 2 4 6

c)

[,1] [,2] [,3]
[1,] 1 3 6
[2,] 2 4 5

d)

[,5] [,6] [,7]
[1,] 1 3 6
[2,] 2 4 5

9. What will be the output of the following R code?

> m <- 1:10
> m

a) 1 2 3 4 5 6 7 8 9 10
b) 1 2 3 4 5 6 7 8 9 10 11
c) 0 1 2 3 4 5 6 7 8 9 10
d) 10 9 8 6 5 4 2 3 1 2
View Answer

10. What will be the output of the following R code?

> x <- 1:3
> y <- 10:12
> cbind(x, y)

a)

x y
[1,] 6 10
[2,] 7 11
[3,] 8 12

b)

x y
[1,] 1 10
[2,] 2 11
[3,] 3 12

c)

x y
[1,] 1 4
[2,] 2 5
[3,] 3 6

d)

x y
[1,] 1 6
[2,] 2 5
[3,] 3 10

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