The variants suffixed with _if
, _at
or _all
apply an
expression (sometimes several) to all variables within a specified
subset. This subset can contain all variables (_all
variants), a
vars()
selection (_at
variants), or variables selected with a
predicate (_if
variants).
A tbl
object.
List of function calls generated by funs()
, or a
character vector of function names, or simply a function.
Bare formulas are passed to rlang::as_function()
to create
purrr-style lambda functions. Note that these lambda prevent
hybrid evaluation from happening and it is thus more efficient to
supply functions like mean()
directly rather than in a
lambda-formula.
A list of columns generated by vars()
,
or a character vector of column names, or a numeric vector of column
positions.
A predicate function to be applied to the columns
or a logical vector. The variables for which .predicate
is or
returns TRUE
are selected. This argument is passed to
rlang::as_function()
and thus supports quosure-style lambda
functions and strings representing function names.
Additional arguments for the function calls in
.funs
. These are evaluated only once, with explicit
splicing.
The verbs with scoped variants are:
mutate()
, transmute()
and summarise()
. See summarise_all()
.
filter()
. See filter_all()
.
group_by()
. See group_by_all()
.
rename()
and select()
. See select_all()
.
arrange()
. See arrange_all()
There are three kinds of scoped variants. They differ in the scope of the variable selection on which operations are applied:
Verbs suffixed with _all()
apply an operation on all variables.
Verbs suffixed with _at()
apply an operation on a subset of
variables specified with the quoting function vars()
. This
quoting function accepts select_vars()
helpers like
starts_with()
. Instead of a vars()
selection, you can also
supply an integerish vector of column
positions or a character vector of column names.
Verbs suffixed with _if()
apply an operation on the subset of
variables for which a predicate function returns TRUE
. Instead
of a predicate function, you can also supply a logical vector.