List variables provided by a tbl.
tbl_vars() returns all variables while tbl_nongroup_vars()
returns only non-grouping variables. The groups attribute
of the object returned by tbl_vars() is a character vector of the
grouping columns.
tbl_vars(x) tbl_nongroup_vars(x)
x |
A tbl object |
group_vars() for a function that returns grouping
variables.
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