mirror of
https://github.com/nim-lang/Nim.git
synced 2025-12-29 01:14:41 +00:00
e1d5356ae9
* Add the ability to sample elements from an openArray according to a parallel array of weights/unnormalized probabilities (any sort of histogram, basically). Also add a non-thread safe version for convenience. * Address Araq comments on https://github.com/nim-lang/Nim/pull/10072 * import at top of file and space after '#'. * Put in a check for non-zero total weight. * Clarify constraint on `w`. * Rename `rand(openArray[T])` to `sample(openArray[T])` to `sample`, deprecating old name and name new (openArray[T], openArray[U]) variants `sample`. * Rename caller-provided state version of rand(openArray[T]) and also clean up doc comments. * Add test for new non-uniform array sampler. 3 sd bound makes it 99% likely that it will still pass in the future if the random number generator changes. We cannot both have a tight bound to check distribution *and* loose check to ensure resilience to RNG changes. (We cannot *guarantee* resilience, anyway. There's always a small chance any test hits a legitimate random fluctuation.)