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  3. Data Manipulation with data.table in R
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Computing in j (I)

Since columns can be treated as variables inside data.table's square brackets ([ ]), you can compute on the columns directly in j.

指示1 / 2

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  • 1

    Using the j argument, find the median duration (the result should be a vector of length 1).

  • 2

    Now, find the median duration where end_station is "Market at 10th" for all subscribers.