Control Structures in R Programming MCQ question and answer with solution

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Each section contains 100 MCQs on Control Structures in R Programming .

. . . . . . . . loop over a list and evaluate a function on each element.

A) apply() B) lapply() C) sapply() D) mapply()

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the correct statement?

A) The next statement causes an exit from the innermost loop that is currently being executed B) There are two statements that can be used to explicitly control looping C) The break statement immediately causes control to return to the start of the loop D) Computation in R consists of sequentially evaluating statements

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Point out the correct statement?

A) Statements, such as x<-1:10 or mean(y), can be separated by either a semicolon or a new line B) Whenever the evaluator is presented with a syntactically complete statement that statement is evaluated and the value returned C) Computation in R consists of sequentially evaluating statements D) All of the mentioned

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following R code?

> printmessage <- function(x) {
+ if(x > 0)
+         print("x is greater than zero")
+ else
+         print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(NA)

A) Error B) Warning C) Messages D) Null

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the wrong statement?

A) The sapply() function behaves similarly to lapply() B) With multiple factors and many levels, creating an interaction can result in many levels that are empty C) apply() can be thought of as a combination of split() and sapply() for vectors only D) You can use tsplit() to evaluate a function single time each with a same argument

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

What is the command used to store R objects in a file?

A) save (x, file="x.Rdata") B) save (x, file=x.Rdata) C) save (x, file="x.Rdata"); D) save (x, file="x.data")

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which of the following R code will print "Neither"?

A) > y <- "meat"
> switch(y, fruit = "banana", vegetable = "broccoli", "Neither") B) > y <- "brocolli"
> switch(y, fruit = "banana", vegetable = "broccoli", "Neither") C) > y <- "banana"
> switch(y, fruit = "banana", vegetable = "broccoli", "Neither") D) > y >- "banana"
> y(y, fruit = "banana", vegetable = "broccoli", "Neither")

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

. . . . . . . . function generates "n" normal random numbers based on the mean and standard deviation arguments passed to the function.

A) rnorm B) vnorm C) knorm D) lnorm

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following R code?

> x <- list(a = matrix(1:4, 2, 2), b = matrix(1:6, 3, 2))
> lapply(x, function(elt) { elt[,1] })

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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

. . . . . . . . is the easiest method for reshaping the data before analysis.

A) Transpose() B) Structure() C) Package D) Function

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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