R Quiz

How many types of R objects are present in R data type?

• 4

• 5

• 6

• 7

Which of this programming language is a dialect of R?

• C

• Python

• CPP

• S

In R the following are all atomic data types EXCEPT!

• matrix

• numeric

• factor

• list

What is the class of the object defined by x <- c(4, TRUE)?

• character

• numeric

• logical

• integer

Suppose I have a list defined as x <- list(2, "a", "b", TRUE). How can I fetch character vector "b" from the list?

• x[[2]]

• x[2]

• x[[3]]

• x[3]

x <- 1:4 , y <- 2:3, x+y = ?

• 3,5,3,4

• 3,5,5,7

• Warning with some output

• Error

To extract first two rows from data frame, we do

• data(c[1,2],)

• data[c(1,2)]

• data(c[1,2])

• data[c(1,2),]

cube <- function(x, n) {

x^3

}

What is the output of the above function? If called using

cube(4)

• 12

• 64

• Warning: n is not used

• Error

Consider the following function

f <- function(x) {

g <- function(y) {

y + z

}

z <- 4

x + g(x)

}

If I run in R:

z <- 10

f(3)

• 10

• 16

• 17

• Warning: y not defined

What is the value of y?

x <- 5

y <- if(x < 3) {

NA

}

else {

10

}

• 10

• NA

• 5

• Error