knitr (version 1.8)

rand_seed: An unevaluated expression to return .Random.seed if exists

Description

This expression returns .Random.seed when eval(rand_seed) and NULL otherwise.

Usage

rand_seed

Arguments

format

language { if (exists(".Random.seed", envir = globalenv())) ; get(".Random.seed", envir = globalenv()) }

Details

It is designed to work with opts_chunk$set(cache.extra = rand_seed) for reproducibility of chunks that involve with random number generation. See references.

References

http://yihui.name/knitr/demo/cache/

Examples

Run this code
eval(rand_seed)
rnorm(1)  # .Random.seed is created (or modified)
eval(rand_seed)

Run the code above in your browser using DataCamp Workspace