R Programming MCQs with answers Page - 114

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Q. Which of the following is the assignment operator in R programming?

• (A) <-
• (B) ->
• (C) =
• (D) ==

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Correct answer - Option (A)

Explanation:

The assignment operator is a left-pointing arrow, so creating and declaring variables looks like this:

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Q. Which of the following is a loosely-typed language?

• (A) R
• (B) T
• (C) S
• (D) Both R and S

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Correct answer - Option (C)

Explanation:

R and S are loosely-typed languages and it supports all of the scalar data types you would expect: string, numbers, and booleans.

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Q. What is the limit to matrices in R?

• (A) One dimensional
• (B) Two dimensional
• (C) Three dimensional
• (D) No limit

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Correct answer - Option (B)

Explanation:

Matrices are like strictly typed two dimensional arrays. You create a matrix using the matrix function, which accepts five parameters: a vector to use as the content, the number of rows to shape the content into, the number of columns to shape the content into, an optional boolean value to indicate whether the content should be shaped by row or by column (the default is FALSE for by column), and a list that contains vectors for row names and column names:

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Q. Which is the function used to add the vectors?

• (A) c()
• (B) add(vectors)
• (C) c(vectors)
• (D) vectors.add

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Correct answer - Option (A)

Explanation:

The c() function is used to add the vectors.

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Q. Which of the following list contains multiple data types?

• (A) Vectors
• (B) Data frames
• (C) Matrices
• (D) None of the mentioned

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Correct answer - Option (B)

Explanation:

Data frames are multidimensional lists that can contain multiple data types.

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Q. Which function is used to create data frames?

• (A) data.frames()
• (B) frame.data()
• (C) data.frame()
• (D) frame(data)

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Correct answer - Option (C)

Explanation:

The data frames can be created using the data.frame() function which accepts a number of vectors as content, and then the following parameters : row.names to specify the vector to use as row identifiers, check.rows to check consistency of row data, and check.names to check for duplicates among other syntactical checks.

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Q. What is the purpose of the method plot()?

• (A) Displays symbols
• (B) Displays charts
• (C) Displays symbols and charts
• (D) None of the mentioned

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Correct answer - Option (B)

Explanation:

The plot() function will display a different type of chart depending on the arguments that you pass in to it.

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Q. Which of the following is/are the features of R?

• (A) Small
• (B) Self-contained
• (C) Extensible
• (D) All of the mentioned

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Correct answer - Option (D)

Explanation:

As a language, R is small, self-contained, extensible, and just fun to use.

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Q. What is the advantage for Linux users using R?

• (A) They get a command sequence to install the particular Linux flavor
• (B) They get a compiled installer
• (C) All of the mentioned
• (D) None of the mentioned

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Correct answer - Option (A)

Explanation:

Instead of a compiled installer, Linux users get the command sequence to install for their particular Linux flavor.

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Q. Which of the following is the base install for R?

• (A) Contrib
• (B) Base
• (C) Rtools
• (D) None of the mentioned

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Correct answer - Option (B)

Explanation:

The PC installer comes in three flavors: Base is the base install, Contrib comes with compiled third-party packages, and Rtools comes with tools to build your own R packages.

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