[R] RStudio question

[Xavier Garcia]

I'm solving the following problem: Create a variable (column) in the “wf”
dataframe named “Zone” that takes value of “tropic” if Latitude is less
than or equal to 30, or “non-tropic” for Latitude greater than 30. Show you
Zone variable. Latitude is a column of my dataframe. I don't know the
sintaxis and the process to create the column.

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