R: Random seed

with_seed {withr}

R Documentation

Random seed

Description

with_seed() runs code with a specific random seed and resets it afterwards.

with_preserve_seed() runs code with the current random seed and resets it afterwards.

Usage

with_seed(seed, code)

with_preserve_seed(code)

Arguments

`seed`	`[integer(1)]` The random seed to use to evaluate the code.
`code`	`[any]` Code to execute in the temporary environment

Value

[any]
The results of the evaluation of the code argument.

Examples

# Same random values:
with_preserve_seed(runif(5))
with_preserve_seed(runif(5))

# Use a pseudorandom value as seed to advance the RNG and pick a different
# value for the next call:
with_seed(seed <- sample.int(.Machine$integer.max, 1L), runif(5))
with_seed(seed, runif(5))
with_seed(seed <- sample.int(.Machine$integer.max, 1L), runif(5))