Nothing
## used for port and other 'internal' assignments
##
## RNGkind() advances the random number stream (so the value of
## .Random.seed needs to be determined before callin), and sets
## .Random.seed (so it is not necessary to set.seed() to ensure that
## the seed is set.
.internal_context_set <-
function()
{
oseed <-
if (exists(".Random.seed", envir = .GlobalEnv, inherits = FALSE)) {
get(".Random.seed", envir = .GlobalEnv, inherits = FALSE)
} else NULL
okind <- RNGkind("L'Ecuyer-CMRG")
list(kind = okind, seed = oseed)
}
.internal_context_unset <-
function(value)
{
RNGkind(value$kind[[1]])
if (!is.null(value$seed)) {
assign(".Random.seed", value$seed, envir = .GlobalEnv)
} else rm(.Random.seed, envir = .GlobalEnv)
}
.internal_rng_stream <- local({
octx <- .internal_context_set()
internal_seed <- nextRNGStream(.Random.seed)
.internal_context_unset(octx)
list(set = function() {
value <- .internal_context_set()
assign(".Random.seed", internal_seed, envir = .GlobalEnv)
value
}, unset = function(octx) {
internal_seed <<-
get(".Random.seed", envir = .GlobalEnv, inherits = FALSE)
.internal_context_unset(octx)
})
})
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