Re: [Swarm-Support] Re: Alternative to grid based agent worlds (java examples)

[Doug Donalson]

It is not very hard to implement a spatially continuous model in swarm.  You
just need to think slightly outside the lines, so to speak.  You can
actually do it two ways.

The first is to just use a single cell.   Grid cells are nothing more than
place holders for ID's.  If you create a spatial object, you can put that
object's ID in the grid cell.  That object can have any sort of
characteristics you want, such as X and Y dimensions and a list of all the
agents in that world.  I believe you can use "object2dDisplay" to display
continuous space results.

Perhaps a better approach is to use a grid in conjunction with continuous
space.  In this case you have a "space" object for each cell that includes,
among other things, a list of all agents in that cell.  That list is defined
as all agents (of a particular type) who's X,Y coordinates actually reside
within space delineated by that cell on the spatial map.  For example, and
agent at location X=5.67 Y=20.09 would be in the list of cell[5][20].  This
has a nice advantage in that if an individual needs information about it's
neighbors, it doesn't been to search the whole system space, just the lists
of the neighboring cells.  Again, I believe that object2dDisplay allows
non-grid based displays.  I used this approach in a past swarm model that is
now translated into C++ and it works quite well.

Cheers,

D4

----- Original Message -----
From: "Marshall, James A R" <address@hidden>
To: <address@hidden>
Sent: Wednesday, May 28, 2003 2:29 AM
Subject: RE: [Swarm-Support] Re: Alternative to grid based agent worlds
(java examples)


> Kana,
>   that depends what you mean by free moving; if you're interested in
non-CA
> models which still use grids then I'll give some of my work yet another
> shameless plug and direct you the the Evolutionary Prisoner's Dilemma
model
> at:
> ftp://ftp.swarm.org/pub/swarm/apps/objc/contrib/EPD-2.1.1-2.1.1.tar.gz
> which is not to say there aren't other examples. If you're looking for
> models with agents inhabiting and interacting in a more realistic
continuous
> space then I'm not aware of any Swarm apps but someone else here might be,
> James
>
> ---
> Dr James A R Marshall
> Complex Systems Modelling Group (COSMIC)
> Department of Earth Science and Engineering
> Imperial College London
> Tel: +44 (0)20 7594 7493
> Fax: +44 (0)20 7594 7444
> Container World Project - http://www.ese.ic.ac.uk/research/containerworld/
>
>
>
> -----Original Message-----
> From: Kanagaraj Krishna [mailto:address@hidden
> Sent: 28 May 2003 08:50
> To: address@hidden
> Subject: [Swarm-Support] Re: Alternative to grid based agent worlds
> (java examples)
>
>
> Hi,
>    Most of the examples of SWARM (java) are based on the grid method of
> modelling its world. Are there any other examples that uses different kind
> of methods (free moving agents meeting each other .......etc). Thanks.
>
> Kana
>
>
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