R Programming MCQs with answers Page - 117

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Q. Is It possible to inspect the source code of R?

  • (A) Yes
  • (B) No
  • (C) Can't say
  • (D) Some times

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Q. In the expression x <- 4 in R, what is the class of 'x' as determined by the `class()' function?

  • (A) Character
  • (B) Numeric
  • (C) Integer
  • (D) Word

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Q. How can we define 'infinity' in R language?

  • (A) Inf
  • (B) Sup
  • (C) Und
  • (D) NaN

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Q. Point out the wrong statement?

  • (A) One nice feature that R shares with many popular open source projects is frequent releases
  • (B) R has sophisticated graphics capabilities
  • (C) S's base graphics system allows for very fine control over essentially every aspect of a plot or graph
  • (D) All of the mentioned

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Q. What is the mode of 'a' in the following R code?
a <- c(1,” a”, FALSE)

  • (A) Numeric
  • (B) Character
  • (C) Integer
  • (D) Logical

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Q. How is a character string defined in R?

  • (A) "Hello, World!"
  • (B) 'Hello, World!'
  • (C) c("Hello", "World")
  • (D) char("Hello, World!")

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Q. How is a data frame created in R?

  • (A) df <- c(1, 2, 3)
  • (B) data.frame(x = 1:3, y = c('A', 'B', 'C'))
  • (C) createDataFrame(1, 2, 3)
  • (D) matrix(1:3, nrow = 1, ncol = 3)

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Q. Point out the correct statement?

  • (A) Character strings are entered using either matching double (") or single (') quotes
  • (B) Character vectors may be concatenated into a vector by the c() function
  • (C) Subsets of the elements of a vector may be selected by appending to the name of the vector an index vector in square brackets
  • (D) All of the mentioned

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Q. Which of the following is a 3-dimensional dataset?

  • (A) Eris
  • (B) Iris
  • (C) Toris
  • (D) None of the above

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Q. Which of the following object is masked from 'package: stats'?

  • (A) filter
  • (B) union
  • (C) set difference
  • (D) get difference

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