Data Structures in R Programming MCQ question and answer with solution

41.
Columns can be arranged in descending order too by using the special . . . . . . . . operator.

A. asc()

B. desc()

C. descending()

D. subset

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42.
Point out the wrong statement?

A. POSIXct is just a very large integer under the hood

B. POSIXlt stores a bunch of other useful information like the day of the week, day of the year, month, day of the month

C. There are a number of generic functions that work on dates and times to help you extract pieces of dates and/or times

D. None of the mentioned

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43.

Which of the following is used for reading tabular data?

> y <- data.frame(a = 1, b = "a")
> dput(y, file = "y.R")
> new.y <- dget("y.R")
> new.y

A. a b
1 1 a

B. a b
1 2 b

C. a b
2 1 a

D. b a
1 a a

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44.
. . . . . . . . is used for outputting a textual representation of an R object.

A. dput

B. dump

C. dget

D. dset

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45.
Which of the following function is identical to read .table?

A. read.csv

B. read.data

C. read.tab

D. read.del

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46.
Point out the correct statement?

A. You can also omit variables using the select() function by using the negative sign

B. The arrange() function also allows a special syntax that allows you to specify variable names based on patterns

C. Reordering rows of a data frame is normally easier to do in R

D. The dplyr package provides any "new" functionality to R

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47.

What will be the output of the following R code?

> x <- Sys.time()
> class(x)

A. "POSIXct" "POSIXt"

B. "POSIXXt" "POSIXt"

C. "POSIXct" "POSIct"

D. "POSIXt" "POSIXt"

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48.
. . . . . . . . function is similar to the existing subset() function in R but is quite a bit faster.

A. rename

B. filter

C. set

D. subset

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49.
Which of the following is used for reading in saved workspaces?

A. unserialize

B. load

C. get

D. set

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50.

What will be the output of the following R code?

> x <- 1:4
> x > 2

A. 1 2 3 4

B. FALSE FALSE TRUE TRUE

C. 1 2 3 4 5

D. 5 4 3 1 2 1

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41.
Columns can be arranged in descending order too by using the special . . . . . . . . operator.

Answer & Solution

42.
Point out the wrong statement?

Answer & Solution

43.
Which of the following is used for reading tabular data?

`> y <- data.frame(a = 1, b = "a") > dput(y, file = "y.R") > new.y <- dget("y.R") > new.y`

Answer & Solution

44.
. . . . . . . . is used for outputting a textual representation of an R object.

Answer & Solution

45.
Which of the following function is identical to read .table?

Answer & Solution

46.
Point out the correct statement?

Answer & Solution

47.
What will be the output of the following R code?

`> x <- Sys.time() > class(x)`

Answer & Solution

48.
. . . . . . . . function is similar to the existing subset() function in R but is quite a bit faster.

Answer & Solution

49.
Which of the following is used for reading in saved workspaces?

Answer & Solution

50.
What will be the output of the following R code?

`> x <- 1:4 > x > 2`

Answer & Solution

Read More Section(Data Structures in R Programming)

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

41. Columns can be arranged in descending order too by using the special . . . . . . . . operator.

Answer & Solution

42. Point out the wrong statement?

Answer & Solution

43. Which of the following is used for reading tabular data? > y <- data.frame(a = 1, b = "a") > dput(y, file = "y.R") > new.y <- dget("y.R") > new.y

Answer & Solution

44. . . . . . . . . is used for outputting a textual representation of an R object.

Answer & Solution

45. Which of the following function is identical to read .table?

Answer & Solution

46. Point out the correct statement?

Answer & Solution

47. What will be the output of the following R code? > x <- Sys.time() > class(x)

Answer & Solution

48. . . . . . . . . function is similar to the existing subset() function in R but is quite a bit faster.

Answer & Solution

49. Which of the following is used for reading in saved workspaces?

Answer & Solution

50. What will be the output of the following R code? > x <- 1:4 > x > 2

Answer & Solution

Read More Section(Data Structures in R Programming)

41.
Columns can be arranged in descending order too by using the special . . . . . . . . operator.

42.
Point out the wrong statement?

43.
Which of the following is used for reading tabular data?

`> y <- data.frame(a = 1, b = "a") > dput(y, file = "y.R") > new.y <- dget("y.R") > new.y`

44.
. . . . . . . . is used for outputting a textual representation of an R object.

45.
Which of the following function is identical to read .table?

46.
Point out the correct statement?

47.
What will be the output of the following R code?

`> x <- Sys.time() > class(x)`

48.
. . . . . . . . function is similar to the existing subset() function in R but is quite a bit faster.

49.
Which of the following is used for reading in saved workspaces?

50.
What will be the output of the following R code?

`> x <- 1:4 > x > 2`