On 7 February 2015 at 19:52, otoomet wrote: | random numbers. For instance, can I be sure that | set.seed(0); print(runif(1)); print(rnorm(1)) | will always print the same numbers, also in the future version of R? There
Yes, pretty much. I've been lurking here over fifteen years, and while I am getting old and forgetful I can remember exactly one such change where behaviour was changed, and (one of the) generators was altered---if memory serves in the earlier days of R 1.* days . [ Goes digging...] Yes, see `help(RNGkind)` which details that R 1.7.0 made a change when "Buggy Kinderman-Ramage" was added as the old value, and "Kinderman-Ramage" was repaired. There once was a similar fix in the very early days of the Mersenne-Twister which is why the GNU GSL has two variants with suffixes _1998 and _1998. So your issue seems like pilot error to me: don't attach the parallel package if you do not plan to work in parallel. But "do if you do", and see its fine vignette on how it provides you reproducibility for multiple RNG streams. In general, you can very much trust R (and R Core) in these matters. Dirk -- http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
