R Programming MCQs - CSE MCQs Questions and Answers

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Point out the correct statement :

The value NaN represents undefined value

Number Inf represents infinity in R

NaN can also be thought of as a missing value

None

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Data frames can be converted to a matrix by calling data._______

matr()

mat()

matrix()

All of the mentioned

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Which of the following statement changes column name to h and f ?

colnames(m) <- c("h", "f")

columnnames(m) <- c("h", "f")

rownames(m) <- c("h", "f")

None of the mentioned

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Point out the wrong statement :

matrices or more generally arrays are multi-dimensional generalizations of vectors

factors provide compact ways to handle categorical data

vectors provide a convenient way to return the results of a statistical computation

All of the mentioned

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What would the following code print ?

x - c("a", "b", "c")

as.logical(x)

a b c

NA NA NA

0 1 2

All of the mentioned

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What would be the output of the following code ?

m - matrix(nrow = 2, ncol = 3)

dim(m)

3 2

2 3

2 2

None of the mentioned

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What would be the output of the following code ?

sqrt(-17)

-4.02

4.02

NaN

None of the mentioned

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Point out the correct statement :

The usual operator, -, can be thought of as a syntactic short-cut to expression operation

Assignment can also be made using the function assignment()

Vectors can be used in arithmetic expressions, in which case the operations are performed element by element

None of the mentioned