The function of this object is that during the evaluation of a
DT[i,j] call, the variable
represents the columns of frame
Specifically, within expression
DT[i, j] the following
f.Ameans “column A” of frame
fmeans “3rd colum” of frame
f[int]means “all integer columns” of
f[:]means “all columns” of
g– namespace for joined frames.
The content on this page is licensed under the Creative Commons Attribution 4.0 License
(CC BY 4.0),
and code samples are licensed under the MIT License.