Re: [Swarm-Support] shuffling a list

[Paul E Johnson]

Swarm now has the List Shuffler class in it, so use that.

I used the shuffler to mix up a list in this model, look in ModelSwarm.m:

http://lark.cc.ku.edu/~pauljohn/Swarm/MySwarmCode/schelling-2.1.140.tar.gz

The usage is like this in my example model

- stepThroughList
{
  id shuffler = [ListShuffler create: self];
  id <Index> index;
  id anObject;


  if (randomize == YES)
    {
      [shuffler shuffleWholeList: agentList];
    }

  index = [agentList begin: self];

  for (anObject = [index next]; [index getLoc]==Member; anObject = 
[index next])
    {
      [anObject step];
    }
  [shuffler drop];
  [index drop];
  return self;
}



Corinne A. Coen wrote:
> I have been unable to get any form of list shuffler to work.
>
> I've downloaded Ted Belding's shuffler.tar.gz and included Shuffler.h and 
> Shuffler.m into my model.  I've included this new object in my Makefile, 
> created it in ModelSwarm.m
>
> Since Ted's Shuffler involves a Shuffle.h and Shuffle.m file, I treated 
> them like an additional object in my model.  I created Shuffle in 
> ModelSwarm.m
>
>   [Shuffler setModel: self];
>   shuffler = [Shuffler create: globalZone];
>
> In Shuffle.m, I set the model.. (of course, identifying the method in 
> Shuffler.h)
>
>   id model;
>
>   @implementation Shuffler
>
>   +(void) setModel: (id) m { model = m; }
>
> I can compile the model, but when I run it, I get the following error 
> message:
>
> error: Shuffler (class)
> Shuffler does not recognize setModel:
> Aborted
>
> So then I removed all of the "setModel" methods, and get the following 
> complaint.
>
> *** event raised for error: InvalidCombination
> shuffler was created without a random
> number generator.
> *** execution terminating due to error
> /home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.107.20010925/src/defobj/Symbol.m:173 
> -[Error(c) _raiseEvent:]
> Aborted
>
>
> Finally, as an alternate approach, I tried using ListShuffler in 
> collections.h.  Unfortunately, when I call  the list shuffler, it does not 
> recognize the method described in the swarm documentation  (e.g., 
> [ListShuffler shuffleWholeList: myList]). 
>
> error: ListShuffler_c.Creating (class)
> ListShuffler_c.Creating does not recognize shuffleWholeList:
> Aborted 
>
> Any ideas for me?
> Corinne Coen
>
>
>
>
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--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
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