R Programming MCQ Questions with answers and solutions Page 47

Q. Which function is difficult to implement?

(A) Lapply
(B) Japply
(C) Vapply
(D) Zapply

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✅ Correct Answer: (C) Vapply

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. . . . . . . . . allows you to modify the error behavior so that you can browse the function call stack

(A) debug()
(B) trace()
(C) recover()
(D) traceback()

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✅ Correct Answer: (C) recover()

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. Which of the following is primary tool for debugging?

(A) debug()
(B) trace()
(C) browser()
(D) traceback()

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✅ Correct Answer: (A) debug()

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. Point out the correct statement?

(A) An environment is a collection of (symbol, value) pairs, i.e. x is a symbol and 3.14 might be its value
(B) If the value of a symbol is not found in the environment in which a function was defined, then the search is continued in the child environment
(C) After the top-level environment, the search continues down the search list until we hit the parent environment
(D) Dynamic scoping turns out to be particularly useful for simplifying statistical computations

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✅ Correct Answer: (A) An environment is a collection of (symbol, value) pairs, i.e. x is a symbol and 3.14 might be its value

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. How will you check if an element is present in a vector?

(A) Match()
(B) Dismatch()
(C) Mismatch()
(D) Search()

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✅ Correct Answer: (A) Match()

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. Which function helps you perform sorting in R language?

(A) Order
(B) Inorder
(C) Simple
(D) Library

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✅ Correct Answer: (A) Order

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

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

(A) Hello, world! Hello, world!
(B) Hello, world! Hello, world! Hello, world!
(C) Hello, world!
(D) Hello, world! Hello, world! Hello, world! Hello, world!

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✅ Correct Answer: (B) Hello, world! Hello, world! Hello, world!

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. . . . . . . . . is used to apply a function over subsets of a vector.

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

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✅ Correct Answer: (C) tapply()

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. Which of the variable in the following R code is variable?
> f <- function(x, y) {
+ x^2 + y / z
+ }

(A) x
(B) y
(C) z
(D) yy

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✅ Correct Answer: (C) z

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

Q. What will be the output of the following R code?
function(p) {
params[!fixed] <- p
mu <- params[1]
sigma <- params[2]
## Calculate the Normal density
a <- -0.5length(data)log(2pisigma^2)
b <- -0.5*sum((data-mu)^2) / (sigma^2)
-(a + b)
}
> ls(environment(nLL))

(A) "data" "fixed" "param"
(B) "data" "variable" "params"
(C) "data" "fixed" "params"
(D) "data" "param"

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✅ Correct Answer: (C) "data" "fixed" "params"

Published by Mr. Dubey ⭐ 111.42K Points at 21-Apr-2024 10:12 am in R Programming

R Programming MCQs with answers Page - 47

Q. Which function is difficult to implement?

Q. . . . . . . . . allows you to modify the error behavior so that you can browse the function call stack

Q. Which of the following is primary tool for debugging?

Q. Point out the correct statement?

Q. How will you check if an element is present in a vector?

Q. Which function helps you perform sorting in R language?

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

Q. . . . . . . . . is used to apply a function over subsets of a vector.

Q. Which of the variable in the following R code is variable?
> f <- function(x, y) {
+ x^2 + y / z
+ }

Q. What will be the output of the following R code?
function(p) {
params[!fixed] <- p
mu <- params[1]
sigma <- params[2]
## Calculate the Normal density
a <- -0.5length(data)log(2pisigma^2)
b <- -0.5*sum((data-mu)^2) / (sigma^2)
-(a + b)
}
> ls(environment(nLL))

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R Programming MCQs with answers Page - 47

Q. Which function is difficult to implement?

Q. . . . . . . . . allows you to modify the error behavior so that you can browse the function call stack

Q. Which of the following is primary tool for debugging?

Q. Point out the correct statement?

Q. How will you check if an element is present in a vector?

Q. Which function helps you perform sorting in R language?

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

Q. . . . . . . . . is used to apply a function over subsets of a vector.

Q. Which of the variable in the following R code is variable? > f <- function(x, y) { + x^2 + y / z + }

Q. What will be the output of the following R code? function(p) { params[!fixed] <- p mu <- params[1] sigma <- params[2] ## Calculate the Normal density a <- -0.5*length(data)*log(2*pi*sigma^2) b <- -0.5*sum((data-mu)^2) / (sigma^2) -(a + b) } > ls(environment(nLL))

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

Q. Which of the variable in the following R code is variable?
> f <- function(x, y) {
+ x^2 + y / z
+ }

Q. What will be the output of the following R code?
function(p) {
params[!fixed] <- p
mu <- params[1]
sigma <- params[2]
## Calculate the Normal density
a <- -0.5length(data)log(2pisigma^2)
b <- -0.5*sum((data-mu)^2) / (sigma^2)
-(a + b)
}
> ls(environment(nLL))