across: Apply a function across multiple columns

In vectra: Columnar Query Engine for Larger-than-RAM Data

Apply a function across multiple columns

Description

Used inside mutate() or summarise() to apply a function to multiple columns selected with tidyselect. Returns a named list of expressions.

Usage

across(.cols, .fns, ..., .names = NULL)

Arguments

.cols	Column selection (tidyselect).
.fns	A function, formula, or named list of functions.
...	Additional arguments passed to .fns.
.names	A glue-style naming pattern. Uses {.col} and {.fn}. Default: "{.col}" if .fns is a single function, "{.col}_{.fn}" if .fns is a named list.

Value

A named list used internally by mutate/summarise.

Examples

f <- tempfile(fileext = ".vtr")
write_vtr(mtcars, f)
# In summarise (conceptual; across is expanded to individual expressions)
unlink(f)

vectra documentation built on May 8, 2026, 9:06 a.m.