Control Structures in R Programming MCQ question and answer with solution

Section 1 Section 2 Section 3

31.
Which function calculates the count of each category of a categorical variable?

A. Table

B. Intact

C. Tables

D. Retabs

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32.
. . . . . . . . applies a function over the margins of an array.

A. apply()

B. lapply()

C. tapply()

D. mapply()

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33.
The syntax of the for loop is?

A. for ( $name in vector )
statement1

B. for loop( name in vector )
statement1

C. for ( name in vector )
statement1

D. forif loop( name in vector )
statement1

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34.

What will be the output of the following R code?

> printmessage2 <- function(x) {
+     if(is.na(x))
+             print("x is a missing value!")
+     else if(x > 0)
+             print("x is greater than zero")
+     else
+             print("x is less than or equal to zero")
+     invisible(x)
+ }
> printmessage2(NA)

A. "x is a missing value!"

B. "x is greater than zero"

C. "x is less than or equal to zero"

D. Error

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35.
. . . . . . . . require you to pass a function whose argument is a vector of parameters.

A. optimize()

B. optimise()

C. opt()

D. opm()

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36.
Which of the following is valid syntax for if else statement in R?

if(<condition>) {
          ## do something
}
else {
          ## do something else
}

if(<condition>) {
          ## do something
}
elseif {
          ## do something else
}

if(<condition>) {
          ## do something
}
else if {
          ## do something else
}

if(<condition>) {
          ##& do something
}
else {
          ##@ do something else
}

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37.
What will be the class of the vector if you concatenate a number and NA?

A. Number

B. Character

C. Integer

D. No class

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38.

What will be the output of the following R code snippet?

> f <- function(a, b) {
+       a^2
+ }
> f(2)

A. 4

B. 3

C. 2

D. 5

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39.
. . . . . . . . function is preferred over sapply as vapply allows the programmer to specific the output type.

A. Lapply

B. Japply

C. Vapply

D. Zapply

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40.
The line of code in R language should begin with a . . . . . . . .

A. Hash symbol

B. Alphabet

C. Number

D. Character

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31.
Which function calculates the count of each category of a categorical variable?

Answer & Solution

32.
. . . . . . . . applies a function over the margins of an array.

Answer & Solution

33.
The syntax of the for loop is?

Answer & Solution

34.
What will be the output of the following R code?

`> printmessage2 <- function(x) { + if(is.na(x)) + print("x is a missing value!") + else if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage2(NA)`

Answer & Solution

35.
. . . . . . . . require you to pass a function whose argument is a vector of parameters.

Answer & Solution

36.
Which of the following is valid syntax for if else statement in R?

Answer & Solution

37.
What will be the class of the vector if you concatenate a number and NA?

Answer & Solution

38.
What will be the output of the following R code snippet?

`> f <- function(a, b) { + a^2 + } > f(2)`

Answer & Solution

39.
. . . . . . . . function is preferred over sapply as vapply allows the programmer to specific the output type.

Answer & Solution

40.
The line of code in R language should begin with a . . . . . . . .

Answer & Solution

Read More Section(Control Structures in R Programming)

Control Structures in R Programming MCQ question and answer with solution | R Programming MCQs

31. Which function calculates the count of each category of a categorical variable?

Answer & Solution

32. . . . . . . . . applies a function over the margins of an array.

Answer & Solution

33. The syntax of the for loop is?

Answer & Solution

34. What will be the output of the following R code? > printmessage2 <- function(x) { + if(is.na(x)) + print("x is a missing value!") + else if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage2(NA)

Answer & Solution

35. . . . . . . . . require you to pass a function whose argument is a vector of parameters.

Answer & Solution

36. Which of the following is valid syntax for if else statement in R?

Answer & Solution

37. What will be the class of the vector if you concatenate a number and NA?

Answer & Solution

38. What will be the output of the following R code snippet? > f <- function(a, b) { + a^2 + } > f(2)

Answer & Solution

39. . . . . . . . . function is preferred over sapply as vapply allows the programmer to specific the output type.

Answer & Solution

40. The line of code in R language should begin with a . . . . . . . .

Answer & Solution

Read More Section(Control Structures in R Programming)

31.
Which function calculates the count of each category of a categorical variable?

32.
. . . . . . . . applies a function over the margins of an array.

33.
The syntax of the for loop is?

34.
What will be the output of the following R code?

`> printmessage2 <- function(x) { + if(is.na(x)) + print("x is a missing value!") + else if(x > 0) + print("x is greater than zero") + else + print("x is less than or equal to zero") + invisible(x) + } > printmessage2(NA)`

35.
. . . . . . . . require you to pass a function whose argument is a vector of parameters.

36.
Which of the following is valid syntax for if else statement in R?

37.
What will be the class of the vector if you concatenate a number and NA?

38.
What will be the output of the following R code snippet?

`> f <- function(a, b) { + a^2 + } > f(2)`

39.
. . . . . . . . function is preferred over sapply as vapply allows the programmer to specific the output type.

40.
The line of code in R language should begin with a . . . . . . . .