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CSE MCQs :: R Programming MCQs

R Programming MCQs - R Programming R – History, Overview
R Programming MCQs - R Programming Control Structures, Functions
R Programming MCQs - R Programming Data Storage, Formats, Operations
R Programming MCQs - R Programming Profiling,Simulation, Data Analysis
R Programming MCQs - R Programming Commands, Packages, Visualizing Data
R Programming MCQs - R Programming Nuts, Bolts, Getting Data In and Out
  1. Point out the correct statement :
    2. A.
    Empty vectors can be created with the vector() function
    B.
    A sequence is represented as a vector but can contain objects of different classes
    C.
    raw" objects are commonly used directly in data analysis
    D.
    None of the mentioned

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  2. Point out the correct statement :
    3. A.
    The value NaN represents undefined value
    B.
    Number Inf represents infinity in R
    C.
    NaN can also be thought of as a missing value
    D.
    None

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  3. Data frames can be converted to a matrix by calling data._______
    4. A.
    matr()
    B.
    mat()
    C.
    matrix()
    D.
    All of the mentioned

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  4. Which of the following statement changes column name to h and f ?
    5. A.
    colnames(m) <- c("h", "f")
    B.
    columnnames(m) <- c("h", "f")
    C.
    rownames(m) <- c("h", "f")
    D.
    None of the mentioned

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  5. Point out the wrong statement :
    6. A.
    matrices or more generally arrays are multi-dimensional generalizations of vectors
    B.
    factors provide compact ways to handle categorical data
    C.
    vectors provide a convenient way to return the results of a statistical computation
    D.
    All of the mentioned

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  6. What would the following code print ?

    x - c("a", "b", "c")
    as.logical(x)
    7. A.
    a b c
    B.
    NA NA NA
    C.
    0 1 2
    D.
    All of the mentioned

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  7. What would be the output of the following code ?

    m - matrix(nrow = 2, ncol = 3)
    dim(m)
    8. A.
    3 2
    B.
    2 3
    C.
    2 2
    D.
    None of the mentioned

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  8. What would be the output of the following code ?

    sqrt(-17)
    9. A.
    -4.02
    B.
    4.02
    C.
    NaN
    D.
    None of the mentioned

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  9. Point out the correct statement :
    10. A.
    The usual operator, -, can be thought of as a syntactic short-cut to expression operation
    B.
    Assignment can also be made using the function assignment()
    C.
    Vectors can be used in arithmetic expressions, in which case the operations are performed element by element
    D.
    None of the mentioned

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