This selection helper matches grouping variables. It can be used within select() and relocate() selections.
See also
groups() and group_vars() for retrieving the grouping variables outside selection contexts.
Examples
mtcars %>% group_by(am, cyl) %>% select(group_cols())
#> am cyl
#> Mazda RX4 1 6
#> Mazda RX4 Wag 1 6
#> Datsun 710 1 4
#> Hornet 4 Drive 0 6
#> Hornet Sportabout 0 8
#> Valiant 0 6
#> Duster 360 0 8
#> Merc 240D 0 4
#> Merc 230 0 4
#> Merc 280 0 6
#> Merc 280C 0 6
#> Merc 450SE 0 8
#> Merc 450SL 0 8
#> Merc 450SLC 0 8
#> Cadillac Fleetwood 0 8
#> Lincoln Continental 0 8
#> Chrysler Imperial 0 8
#> Fiat 128 1 4
#> Honda Civic 1 4
#> Toyota Corolla 1 4
#> Toyota Corona 0 4
#> Dodge Challenger 0 8
#> AMC Javelin 0 8
#> Camaro Z28 0 8
#> Pontiac Firebird 0 8
#> Fiat X1-9 1 4
#> Porsche 914-2 1 4
#> Lotus Europa 1 4
#> Ford Pantera L 1 8
#> Ferrari Dino 1 6
#> Maserati Bora 1 8
#> Volvo 142E 1 4