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.
repeatable(rngfunc, seed = stats::runif(1, 0, .Machine$integer.max))The function that is affected by the R session's seed.
The seed to set every time the resulting function is called.
A repeatable version of the function that was passed in.
When called, the returned function attempts to preserve the R session's
current seed by snapshotting and restoring
base::.Random.seed().
rnormA <- repeatable(rnorm)
rnormB <- repeatable(rnorm)
rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111
#> [1] 0.7794024 -0.3017073 -1.4266987
rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111
#> [1] 0.7794024 -0.3017073 -1.4266987
rnormA(5) # [1] 1.8285879 -0.7468041 -0.4639111 -1.6510126 -1.4686924
#> [1] 0.7794024 -0.3017073 -1.4266987 -0.6770044 1.8590043
rnormB(5) # [1] -0.7946034 0.2568374 -0.6567597 1.2451387 -0.8375699
#> [1] 0.8524235 -1.0549998 1.0207165 0.2046784 0.6256688