Basic R Programs for Beginners

Basic R Programs for Beginners - Important Points

1.		What is the output of the following R code snippet? x <- 2 y <- 3 z <- x + y print(z)

What is the output of the following R code snippet?

x <- 2
y <- 3
z <- x + y
print(z)

A. 2

B. 3

C. 5

D. Error

View Answer Discuss Work Space

Answer: option c

Explanation:

The code defines two variables x and y, adds them together and stores the result in z. Then it prints the value of z, which is 5.

2.		What is the output of the following R code snippet? x <- "Hello" y <- "World" z <- paste(x, y) print(z)

What is the output of the following R code snippet?

x <- "Hello"
y <- "World"
z <- paste(x, y)
print(z)

A. HelloWorld

B. Hello World

C. Error

D. NA

View Answer Discuss Work Space

Answer: option b

Explanation:

The code defines two variables x and y as character strings, concatenates them using the paste function, and stores the result in z. Then it prints the value of z, which is "Hello World".

3.		What is the output of the following R code snippet? x <- c(1, 2, 3, 4, 5) y <- sum(x) print(y)

What is the output of the following R code snippet?

x <- c(1, 2, 3, 4, 5)
y <- sum(x)
print(y)

A. 1

B. 5

C. 15

D. Error

View Answer Discuss Work Space

Answer: option c

Explanation:

The code defines a vector x with 5 elements, then calculates the sum of the elements using the sum function and stores the result in y. Then it prints the value of y, which is 15.

4.		What is the output of the following R code snippet? x <- 1:10 y <- x[x %% 2 == 0] print(y)

What is the output of the following R code snippet?

x <- 1:10
y <- x[x %% 2 == 0]
print(y)

A. 1 3 5 7 9

B. 2 4 6 8 10

C. 1 2 3 4 5

D. 2 3 5 7 11

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Answer: option b

Explanation:

The code defines a vector x with integers from 1 to 10, then uses the modulo operator to select only the even elements of x, and stores the result in y. Then it prints the value of y, which is the vector [2 4 6 8 10].

5.		What is the output of the following R code snippet? x <- c(1, 2, 3, 4, 5) y <- c(2, 3, 4) z <- x %in% y print(z)

What is the output of the following R code snippet?

x <- c(1, 2, 3, 4, 5)
y <- c(2, 3, 4)
z <- x %in% y
print(z)

A. TRUE TRUE TRUE FALSE FALSE

B. FALSE TRUE TRUE TRUE FALSE

C. TRUE TRUE FALSE FALSE FALSE

D. FALSE FALSE FALSE TRUE TRUE

View Answer Discuss Work Space

Answer: option b

Explanation:

The code defines two vectors x and y, then uses the %in% operator to check which elements of x are also present in y. The result is a logical vector with the same length as x, indicating whether each element is in y or not. The resulting vector is [FALSE TRUE TRUE TRUE FALSE].

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