repeatable
repeatable(rngfunc, seed = runif(1, 0, .Machine$integer.max))
Arguments
rngfunc | The function that is affected by the R session's seed. |
---|---|
seed | The seed to set every time the resulting function is called. |
Make a random number generator repeatable
Value
A repeatable version of the function that was passed in.
Description
Given a function that generates random data, returns a wrapped version of that function that always uses the same seed when called. The seed to use can be passed in explicitly if desired; otherwise, a random number is used.
Note
When called, the returned function attempts to preserve the R session's
current seed by snapshotting and restoring
.Random.seed
.
Examples
rnormA <- repeatable(rnorm) rnormB <- repeatable(rnorm) rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111[1] -0.8741222 1.2961640 0.2874364rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111[1] -0.8741222 1.2961640 0.2874364rnormA(5) # [1] 1.8285879 -0.7468041 -0.4639111 -1.6510126 -1.4686924[1] -0.8741222 1.2961640 0.2874364 0.6916903 -1.1186962rnormB(5) # [1] -0.7946034 0.2568374 -0.6567597 1.2451387 -0.8375699[1] -0.5132492 0.5085536 -1.7886134 0.8040884 -0.1612562