withSeed

0th

Percentile

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.

Aliases
  • withSeed
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)
Documentation reproduced from package R.utils, version 2.0.0, License: LGPL (>= 2.1)

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