withSeed
From R.utils v2.0.0
by Henrik Bengtsson
Evaluate an R expression with a temporarily set random set
Evaluate an R expression with a temporarily set random set.
- Keywords
- programming, IO
Usage
withSeed(expr, seed, ..., envir=parent.frame())
Arguments
- expr
- The R expression to be evaluated.
- seed, ...
- Arguments passed to
set.seed
(). - envir
- The
environment
in which the expression should be evaluated.
Details
Upon exit (also on errors), this function will restore
.Random.seed
in the global environment to the value
it had upon entry. If it did not exist, it will be removed.
Value
- Returns the results of the expression evaluated.
See Also
Internally, set.seed
() is used to set the random seet.
Examples
# Generate a random number
y0 <- runif(1)
print(y0)
# Generate a random number using the same seed over and over
yp <- NULL
for (ii in 1:10) {
y <- withSeed({
runif(1)
}, seed=0x42)
print(y)
# Assert identical
if (!is.null(yp)) stopifnot(identical(y, yp))
yp <- y
}
# Generate a random number
y <- runif(1)
print(y)
Community examples
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