Record and restore a random state
The aim of this function is to record, manipulate and restore a random state
getRandomState(seed = NULL)
seed |
seed argument to set.seed(), typically a number. Additional options: NULL = no seed is set, but return includes function for restoring random seed. F = function does nothing, i.e. neither seed is changed, nor does the returned function do anything |
This function is intended for two (not mutually exclusive tasks)
a) record the current random state
b) change the current random state in a way that the previous state can be restored
a list with various infos about the random state that after function execution, as well as a function to restore the previous state before the function execution
Florian Hartig
set.seed(13)
runif(1)
# testing the function in standard settings
currentSeed = .Random.seed
x = getRandomState(123)
runif(1)
x$restoreCurrent()
all(.Random.seed == currentSeed)
# if no seed was set in env, this will also be restored
rm(.Random.seed) # now, there is no random seed
x = getRandomState(123)
exists(".Random.seed") # TRUE
runif(1)
x$restoreCurrent()
exists(".Random.seed") # False
runif(1) # re-create a seed
# with seed = false
currentSeed = .Random.seed
x = getRandomState(FALSE)
runif(1)
x$restoreCurrent()
all(.Random.seed == currentSeed)
# with seed = NULL
currentSeed = .Random.seed
x = getRandomState(NULL)
runif(1)
x$restoreCurrent()
all(.Random.seed == currentSeed)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.