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 .

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

> lm <- function(x) { x * x }
> lm

A) function(x) { x * x } B) func(x) { x * x } C) function(x) { x / x } D) function { x $ x }

Discuss

Answer & Solution

Answer: Option A

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

Write the syntax to set the path of the current working directory in R environment?

A) Setwd("dipath") B) Setwd(dir_path) C) Setwd("dir_path") D) Set("dir_path")

Discuss

Answer & Solution

Answer: Option C

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

Which of the following language supports lexical scoping?

A) Perl B) Python C) Common Lisp 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 value of following R expression?

A) Warning in log(c(-1, 2)): NaNs produced B) Error in log(c(-1, 2)): NaNs produced C) Message D) All of the mentioned

Discuss

Answer & Solution

Answer: Option B

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

What will be the output of the following R code?

> x <- 3
> switch(6, 2+2, mean(1:10), rnorm(5))

A) 10 B) 1 C) NULL D) 5

Discuss

Answer & Solution

Answer: Option C

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

Warnings are generated by the . . . . . . . . function.

A) warning() B) error() C) run() D) message()

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 traceback() function must be called immediately after an error occurs B) The debugger calls the browser at the very low level of the function body C) Every time you call the mod() function it will launch the interactive debugger D) R provides only two tools to help you with debugging your code

Discuss

Answer & Solution

Answer: Option A

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

Point out the correct statement?

A) Vectorizing the function can be accomplished easily with the Vectorize() function B) There are different levels of indication that can be used, ranging from mere notification to fatal error C) Vectorizing the function can be accomplished easily with the vector() function D) Warnings are generated by the run() function

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 snippet?

> paste("a", "b", sep = ":")

A) "a+b" B) "a=b" C) "a:b" D) a*b

Discuss

Answer & Solution

Answer: Option C

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

100

What will be the output of the following R code?

> mean(x)
  Error in mean(x) : object 'x' not found
> traceback()

A) 1: mean(x) B) Null C) 0 D) 2

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