# Make a random number generator repeatable — repeatable

repeatable(rngfunc, seed = stats::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. |

### 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.

### Value

A repeatable version of the function that was passed in.

### Note

When called, the returned function attempts to preserve the R session's
current seed by snapshotting and restoring
`base::.Random.seed()`

.

### Examples

rnormA <- repeatable(rnorm) rnormB <- repeatable(rnorm) rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111 rnormA(3) # [1] 1.8285879 -0.7468041 -0.4639111 rnormA(5) # [1] 1.8285879 -0.7468041 -0.4639111 -1.6510126 -1.4686924 rnormB(5) # [1] -0.7946034 0.2568374 -0.6567597 1.2451387 -0.8375699