Re: Copy and initSeed: SOLUTION

[Sven Thommesen]

Benedikt Stefansson wrote:
> 
> Thanks Rick for the reply,
> 
> I am still in trouble though. [uniformRandom initSeed: seed] doesn't
> work because uniformRandom doesn't respond to the initSeed message.
> Apparently the initSeed message belongs to one of the
> random generators, but there are a number of them and I haven't
> been able to create an instance of one after repeated tries (e.g.
> [SWB createBegin] or somesuch).
> 
> And I was also under the impression that copy should be an inherited
> method from SwarmObject, but it doesn't seem to be.
> 
> If one of the hivemeisters has time to clear up this confusion I would
> appreciate it...
> 
> -Benedikt.
> 

Benedikt,

since nobody's jumped in from the Hive yet, I'll step up:

a) to set the seed for the supplied Uniform generator, you say

   [ [ uniformRandom getGenerator] initSeed: seed];

b) to define your own generators in the same manner as the 'magical' one
supplied with Swarm, do this:

1. in modelSwarm.m, ABOVE the @implementation line, put:

   id randomGenerator2, randomGenerator3;
   id uniformRandom2, uniformRandom3;

2. in modelSwarm.m, in method buildObjects, you create the critters:

   randomGenerator2 = [[PMMLCG1 alloc] init]; // random seed
   uniformRandom2 = [[[Uniform alloc] init] setGenerator:
randomGenerator2];

   randomGenerator3 = [[SWB3 alloc] init]; // another generator
   uniformRandom3 = [[[Uniform alloc] init] setGenerator:
randomGenerator3];

<These are still old-style objects, hence the non-Swarmy creation.
I'll be turning the generators into proper Swarm objects as soon as
there's agreement on what methods to include ...>

3. create a file "Random.h" which you #import into any module (the .h
file or the .m file, whichever you choose) that uses these generators:


   #import <random/PMMLCG.h>
   #import <random/SWB.h>
   #import <random/Uniform.h>

   extern PMMLCG * randomGenerator2;
   extern Uniform * uniformRandom2;

   extern SWB * randomGenerator3;
   extern Uniform * uniformRandom3;

The net effect is that these generators are globally visible in your
program, just like the one already supplied.

Enjoy!

Sven Thommesen

PS: somebody else will have to answer your question about copying
objects ...