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.

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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