Skip to contents

Temporarily Set the Backend

Source: R/backend.R
local_backend.Rd

Set the anvl.backend option for a scope: local_backend() until the calling frame exits, with_backend() for the duration of code. Every array built and every operation run in that scope uses the backend, and R values materialize at its default data types (see default_dtypes()).

Usage

local_backend(backend, envir = parent.frame())

with_backend(backend, code)

Arguments

backend

(character(1))
Backend to use ("pjrt" or "quickr").

envir

(environment)
The environment to scope the change to.

code

(any)
An expression to evaluate with the given backend.

Value

local_backend() returns the previous value of the option, as list(anvl.backend = ), invisibly. with_backend() returns the result of evaluating code.

See also

active_backend()

Examples

f <- function() {
  local_backend("quickr")
  active_backend()
}
f()
#> [1] "quickr"
active_backend()
#> [1] "pjrt"
with_backend("quickr", active_backend())
#> [1] "quickr"