April 17, 2022

R Interview Questions [ 2022 ]

R Programming Language Online Quiz 2
[[ 25 Questions/Answers in random order ]]





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6 comments:

  1. Hi There,

    Gasping at your brilliance! Thanks, a tonne for sharing all that content. Can’t stop reading. Honestly!

    I have a data frame with a lot of columns with binary values.

    Is it possible to count the number of rows that satisfy a condition?

    Scope for names introduced in a python program is a region where it could be used, without any qualification. That is, scope is region where the unqualified reference to a name can be looked out in the namespace to find the object.

    ex: the number of rows for Col1 and Col2 that are both 1 is 2

    similarly the number of rows for Col1 and Col2 that are 0 and 1 is 1

    Is there an easy way to do this rather than looping all over the data frame?

    Thank you very much and will look for more postings from you.

    Thanks a heaps,
    Kevin

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