selector: Fast selection of 'data.table' columns
In HughParsonage/hutils: Miscellaneous R Functions and Aliases

selector

R Documentation

Fast selection of `data.table` columns

Description

Present since hutils 1.2.0.

Usage

selector(DT, ..., cols = NULL, preserve.key = TRUE, shallow = FALSE)

Arguments

`DT`	A `data.table`.
`...`	Unquoted columns names.
`cols`	Character vector of column names.
`preserve.key`	(logical, default: `TRUE`) Reapply the key (if `DT` has one)?
`shallow`	(logical, default: `FALSE`) Should the result be a shallow `copy` of `DT`'s columns or should the columns be assigned by reference? If `TRUE`, any modification to the result also modifies the selected columns in `DT`.

Value

DT with the selected columns.

Examples

RQ("nycflights13", no = {
 library(nycflights13)
 library(data.table)
 fs <- as.data.table(flights)
 fs1 <- selector(fs, year, month, day, arr_delay)
 fs1[, arr_delay := NA]
})

HughParsonage/hutils documentation built on June 9, 2025, 12:44 a.m.