groupVec Class Data Access
Accesses the data list of a
the object to access.
The function returns the
columns slot of
You can use it on the left side of an assignment, in which case the
is replaced, with some validity checking. Also, if
the new value has a different length than the old one, the column names and
classes are extended or truncated appropriately, with the column
classes for new columns derived from the class of the new data in the columns.
returns the data list of
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