Data Types and Variables in R
Data Types and Variables in R - Important Points
| 6. | Which of the following data types is used to represent a two-dimensional table in R? |
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A. Vector
B. List
C. Data frame
D. Matrix
View Answer Discuss Work SpaceAnswer: option c
Explanation:
A data frame in R is used to represent a two-dimensional table.
| 7. | Which of the following is a valid way to create a vector in R? |
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A. vec <- 1 2 3
B. vec <- c(1, 2, 3)
C. vec <- c(1 2 3)
D. vec <- [1, 2, 3]
View Answer Discuss Work SpaceAnswer: option b
Explanation:
To create a vector in R, we use the c() function and separate the elements with commas.
| 8. | Which of the following is a valid way to create a list in R? |
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A. list <- c(1, "a", TRUE)
B. list <- list(1, "a", TRUE)
C. list <- [1, "a", TRUE]
D. list <- {1, "a", TRUE}
View Answer Discuss Work SpaceAnswer: option b
Explanation:
To create a list in R, we use the list() function and separate the elements with commas.
| 9. | Which of the following is a valid way to create a data frame in R? |
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A. df <- data.frame(1, 2, 3)
B. df <- data.frame(c(1, 2, 3))
C. df <- data.frame(x = c(1, 2, 3), y = c("a", "b", "c"))
D. df <- data.frame(list(1, "a", TRUE))
View Answer Discuss Work SpaceAnswer: option c
Explanation:
To create a data frame in R, we use the data.frame() function and specify the column names and values.
| 10. | Which of the following data types is used to represent missing or undefined values in R? |
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A. NA
B. NaN
C. Inf
D. #NAME?
View Answer Discuss Work SpaceAnswer: option a
Explanation:
NA is used in R to represent missing or undefined values.