Control Structures in R Programming MCQ question and answer with solution

Section 1 Section 2 Section 3

31.
A function, together with an environment, makes up what is called a . . . . . . . . closure.

A. formal

B. function

C. reflective

D. symmetry

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32.
Body of lapply function is?

function (X, FUN, ...)
{
    FUN <- match.fun(FUN)
    if (!is.vector(X) || is.object(X))
       X <- as.list(X)
    .Internal(lapply(X, FUN))
}

function (X, FUN, ...)
{
    FUN <- match.fun(FUN)
    if (!is.vector(X) | is.object(X))
      X <- as.list(X)
    .Internal(lapply(X, FUN))
}

function (X, FUN, ...)
{
    FUN <- match.fun(FUN)
    if (is.vector(X) || is.object(X))
      X <- as.list(X)
    .Internal(lapply(X, FUN))
}

function (X, FUN, ...)
{
    FUN <- match.fun(FUN)
    if (is.vector(X) || is.object(X))
}

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33.
. . . . . . . . is used to break the execution of a loop.

A. next

B. skip

C. break

D. delete

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34.
Write a function to extract the first name in the string "Mrs. Jake Luther"?

A. Substring

B. Substr

C. Substi

D. Return

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35.

Which of the following R code will print the following result?

[[1]]
[1] 2.263808
[[2]]
[1] 1.314165 9.815635
[[3]]
[1] 3.270137 5.069395 6.814425
[[4]]
[1] 0.9916910 1.1890256 0.5043966 9.2925392

A. > x <- 1:4
> lapply(x, runif, min = 0, max = 10)

B. > x <- 1:4
> lapply(x, runif, min = 0, max = 9)

C. > x <- 1:3
> lapply(x, runif, min = 0, max = 10)

D. > x <- 1:4
> lapply(x, runif, min = 0, max = 6)

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36.

What will be the output of the following R code?

> f <- function(num) {
+ hello <- "Hello, world!\n"
+ for(i in seq_len(num)) {
+                    cat(hello)
+ }
+                    chars <- nchar(hello) * num
+                    chars
+ }
> meaningoflife <- f(3)
> print(meaningoflife)

A. 32

B. 42

C. 52

D. 46

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37.
. . . . . . . . function is same as lapply in R.

A. apply()

B. lapply()

C. sapply()

D. mapply()

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38.

What would be the value of following R expression?

log(-1)

A. Warning in log(-1): NaNs produced

B. 1

C. Null

D. 0

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39.
The . . . . . . . . for R are the main feature that make it different from the original S language.

A. scoping rules

B. closure rules

C. environment rules

D. closure & environment rules

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40.

What will be the output of the following R code?

> f <- function(elt) {
+ elt[, 1]
+ }
> lapply(x, f)

A. $a
[1] 1 2
$b
[1] 1 2 3

B. $a
[1] 1 2 3
$b
[1] 1 2 3

C. $a
[1] 1 2 3
$b
[1] 1 2

D. Error

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31.
A function, together with an environment, makes up what is called a . . . . . . . . closure.

Answer & Solution

32.
Body of lapply function is?

Answer & Solution

33.
. . . . . . . . is used to break the execution of a loop.

Answer & Solution

34.
Write a function to extract the first name in the string "Mrs. Jake Luther"?

Answer & Solution

35.
Which of the following R code will print the following result?

`[[1]] [1] 2.263808 [[2]] [1] 1.314165 9.815635 [[3]] [1] 3.270137 5.069395 6.814425 [[4]] [1] 0.9916910 1.1890256 0.5043966 9.2925392`

Answer & Solution

36.
What will be the output of the following R code?

`> f <- function(num) { + hello <- "Hello, world!\n" + for(i in seq_len(num)) { + cat(hello) + } + chars <- nchar(hello) * num + chars + } > meaningoflife <- f(3) > print(meaningoflife)`

Answer & Solution

37.
. . . . . . . . function is same as lapply in R.

Answer & Solution

38.
What would be the value of following R expression?

`log(-1)`

Answer & Solution

39.
The . . . . . . . . for R are the main feature that make it different from the original S language.

Answer & Solution

40.
What will be the output of the following R code?

`> f <- function(elt) { + elt[, 1] + } > lapply(x, f)`

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. A function, together with an environment, makes up what is called a . . . . . . . . closure.

Answer & Solution

32. Body of lapply function is?

Answer & Solution

33. . . . . . . . . is used to break the execution of a loop.

Answer & Solution

34. Write a function to extract the first name in the string "Mrs. Jake Luther"?

Answer & Solution

35. Which of the following R code will print the following result? [[1]] [1] 2.263808 [[2]] [1] 1.314165 9.815635 [[3]] [1] 3.270137 5.069395 6.814425 [[4]] [1] 0.9916910 1.1890256 0.5043966 9.2925392

Answer & Solution

36. What will be the output of the following R code? > f <- function(num) { + hello <- "Hello, world!\n" + for(i in seq_len(num)) { + cat(hello) + } + chars <- nchar(hello) * num + chars + } > meaningoflife <- f(3) > print(meaningoflife)

Answer & Solution

37. . . . . . . . . function is same as lapply in R.

Answer & Solution

38. What would be the value of following R expression? log(-1)

Answer & Solution

39. The . . . . . . . . for R are the main feature that make it different from the original S language.

Answer & Solution

40. What will be the output of the following R code? > f <- function(elt) { + elt[, 1] + } > lapply(x, f)

Answer & Solution

Read More Section(Control Structures in R Programming)

31.
A function, together with an environment, makes up what is called a . . . . . . . . closure.

32.
Body of lapply function is?

33.
. . . . . . . . is used to break the execution of a loop.

34.
Write a function to extract the first name in the string "Mrs. Jake Luther"?

35.
Which of the following R code will print the following result?

`[[1]] [1] 2.263808 [[2]] [1] 1.314165 9.815635 [[3]] [1] 3.270137 5.069395 6.814425 [[4]] [1] 0.9916910 1.1890256 0.5043966 9.2925392`

36.
What will be the output of the following R code?

`> f <- function(num) { + hello <- "Hello, world!\n" + for(i in seq_len(num)) { + cat(hello) + } + chars <- nchar(hello) * num + chars + } > meaningoflife <- f(3) > print(meaningoflife)`

37.
. . . . . . . . function is same as lapply in R.

38.
What would be the value of following R expression?

`log(-1)`

39.
The . . . . . . . . for R are the main feature that make it different from the original S language.

40.
What will be the output of the following R code?

`> f <- function(elt) { + elt[, 1] + } > lapply(x, f)`