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] -0.1531227 -1.5179189 -0.1287926
rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111
#> [1] -0.1531227 -1.5179189 -0.1287926
rnormA(5) # [1] 1.8285879 -0.7468041 -0.4639111 -1.6510126 -1.4686924
#> [1] -0.15312274 -1.51791886 -0.12879261 -0.09043412 -0.29487271
rnormB(5) # [1] -0.7946034 0.2568374 -0.6567597 1.2451387 -0.8375699
#> [1] 0.8294443 1.3802259 0.7964055 0.4615132 1.0526170