RE: [Repast-developer] More on the space lib (technicalities)

[North, M. <no...@an...>]

As a note, the interface java.awt.Shape allows arbitrary shapes to be
defined.  It could be used as an advanced extents parameter.

Hexagonal, or other types of diffusion, could be based a discrete
approximation to the diffusion equations for a continuous space.  These
types of approximations have been extensively used in finite element
analysis.

Mike


Michael J. North
Software Engineer
Argonne National Laboratory
Decision and Information Sciences Division
Complex Adaptive Systems Section

9700 S. Cass Avenue
Argonne, IL 60439

E-mail: no...@an...
Telephone: (630) 252-6234
Facsimile: (630) 252-6073


-----Original Message-----
From: Laszlo Gulyas [mailto:gu...@la...]
Sent: Wednesday, November 21, 2001 4:12 PM
To: Nick Collier
Cc: rep...@li...
Subject: [Repast-developer] More on the space lib (technicalities)




Hi All,

I've continued my work on hexagonal spaces and came across a couple of
new issues.

First of all, it turns out that, in the end, I might need to revise my 
earlier musings
on the design of the space classes. (:-)) The problem is that in the 
original grid
classes getXXXNeighbors (XXX=VonNeumann or Moore) and findMaximum/
findMinimum have _two_ extent parameters. (One for the horizontal
and one for the vertical extent.) In terms of the hexa grid, however, I am 
having
hard time to come up with a meaningful interpretation of these. This would
not
be a problem in itself, but this means that it is going to be hard to create
a
common interface for these classes. (That is, unless we keep the core
functionality only in the interface and put this additional functionality 
into the
respective subclasses.) What would be your advice on this?

Second, I am having problems with the Diffuse2D class. I thought, I could
provide a hexagonal version of this class, too. My problem, however, is
that the diffusion rules seem somewhat awkward to me. Any idea how
they should be implemented on a hexagonal grid? Or at least, what they
are based on? (Except that they are based on Swarm. :-))

Finally, I noticed that the compareMax.compareMin methods are private
in Object2DGrid. Any reason these should not be available to subclasses?
(I can live with them as they are, I am just wondering if I overlooked 
something.
It would be nice to know, since I am designing my own space classes, and
certainly I want to learn from what is already in the lib.)

Thanks!

Gulya
.
--
Laszlo Gulyas, MSc              Phone: (617) 
384-9216
Government Department   Weatherhead Center for International Affairs
Harvard University              602C Coolidge Hall
1737 Cambridge street           Cambridge, MA-02138


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