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Cool about the Bag shuffle. Didn't know that.



On Sun, Oct 25, 2015 at 5:40 PM Sean Luke <[log in to unmask]> wrote:

> On Oct 25, 2015, at 3:39 AM, Ernesto Carrella <[log in to unmask]>
> wrote:
>
> > It seems like using elements() to bag agents and then step them in a for
> loop is a recipe for artifacts: agents in the top left corner always act
> before agents in the bottom right.
>
> Bag vals = grid.elements();
> vals.shuffle(state.random);
>
> And you're ready to go.
>
> > I usually do what Russell does, keeping a reference to agents in a
> separate collection and stepping that, but I prefer an ArrayList to aBag;
> partially because of generics but mostly because I can call
> Collections.shuffle(agentList,random) and randomize their order before
> stepping them.
>
> I would recommend strongly against using java.util.Random, and hence
> Collections.shuffle(...)
>
> > The only caveat is that MersenneTwisterFast is not a kosher Random
> object so you can’t pass it directly, but you can just pass a seed from the
> MASON randomizer to a standard Java one (or extend the MASON one so that it
> fulfills Randominterface).
>
> Again: it is unwise to use java.util.Random in a simulation.
>
> Sean
>