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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. What would be the output of the following code ?

     p - as.POSIXlt(x)
     names(unclass(p))
     p$wday
    2. A.
    1
    B.
    2
    C.
    3
    D.
    NULL

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

    x - 1:4
     y - 6:9
     z - x + y
     z
    3. A.
    7 9 11 13
    B.
    7 9 11 13 14
    C.
    9 7 11 13
    D.
    NULL

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

    x - 1:4
     y - 6:9
     x/y
    4. A.
    0.1666667 0.2857143 0.4444444
    B.
    0.1666667 0.2857143 0.3750000 0.4444444
    C.
    0.2857143 0.3750000 0.4444444
    D.
    All of the mentioned

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  4. Which of the following argument denotes if the file has a header line ?
    5. A.
    header
    B.
    sep
    C.
    file
    D.
    All of the mentioned

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  5. Point out the wrong statement :
    6. A.
    $ operator semantics are similar to that of [[
    B.
    The [[ operator can take an integer sequence if you want to extract a nested element of a list
    C.
    The $ operator can be used to extract multiple elements from a list
    D.
    All of the mentioned

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  6. Columns can be arranged in descending order too by using the special ____ operator.
    7. A.
    asc()
    B.
    desc()
    C.
    descending()
    D.
    subset

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  7. Connections to text files can be created with the ________ function.
    8. A.
    url
    B.
    gzfile
    C.
    bzfile
    D.
    file

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