That is a good idea and something we are working toward. Unfortunately situation is a bit complicated at the moment: in the 0.4 branch, there are actually 2 RNGs operating side-by-side (one for Base rand methods, and for the Rmath library used by Distributions). Hopefully this can get resolved soon, as we do want to make these sort of stateful computations clearer and easier to work with.
Simon On Tuesday, 24 February 2015 16:41:24 UTC, Steve Kay wrote: > > Many thanks for your replies Simon and Jameson. > > From my perspective it would be great if Julia could replicate the python > functions random.getstate(), random.setstate(state) amd > random.jumpahead(n) on https://docs.python.org/2/library/random.html . > > My trouble with your suggestion Jameson is my strategies will be drawing > from different distributions ( e.g poisson for one, normal for another). I > realise I could use inverse CDF method on unif draws (but thought this > would take longer to run than simply drawing from the correct distributions > (maybe I'm wrong). Thanks again. > > Steve > > On Monday, February 23, 2015 at 5:02:01 PM UTC, Steve Kay wrote: >> >> I'm trying to build a simulation model with sequential stages. I only >> want to set the seed for the random number generator once at the very start >> of the simulation comparing different possible strategies. Stage 1 is >> common to all strategies and involves running lots of sims to reach stage 2 >> . At this stage my strategies follow different routes. Ideally I'd like to >> store the state of the random number generator just before starting stage 2 >> (and be able to recall it at a later time). That way I can run my first >> strategy through, then reset to the same state at the start of stage 2 and >> run the next strategy through, etc. All strategies then facing the same >> random conditions (without having to rerun stage 1 or set another seed at >> stage 2).. Are there such commands that store and reset the number >> generator to a particular state? Any help much appreciated. >> >> Best, >> >> Steve >> >
