Re: Density Graph, How?

[Doug Donalson;]

I am assuming that by a density graph you mean that you want to plot the 
YX coordinates of your individuals as points in a square area.  I have 
done this two ways.  The first is using a scatterplot in S-plus.  This
works very nicely and some of these are included in a paper soon to be 
published in Ecology.  These were in my pre-SWARM days but the idea is 
the same.  At times that you want data, have a routine that goes through 
and has each agent write its position to a file.  Then have S-plus read 
in and plot the file.  

I also see no reason that you can't use the SWARM 2D plots to do the same 
thing.  If you choose a small enough resolution on a 2D plot than you can 
have a reasonable probability that 2 or more individuals will not end up in 
the same square.  You can then just assign two colors for each lattice point, 
occupied or unoccupied.  If you are dealing with a large number of 
individuals the resolution of any graph package will end up with overlap 
just like a lattice plot because there is a physical size to the point the 
printer plots.  

Cheers,

   Doug Donalson  
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On Tue, 30 Sep 1997, Jae Chan Oh wrote:

> Hi,
> I am trying to draw a sort of density graph (1-D or 2-D)
> given real-valued data. It basically should show how agents are
> distributed in a *contiguous* space. (discrete space wouldn't do, therefore)
> 
> I was thinking about BLT graph but I was wondering whether there is/are
> any better way to plot this information.
> 
> If anyone has a code fragment of doing this, please give me the pointer
> to it.
> 
> Thank you,
> 
> -Jae
> ---
> 
> 
>                 Jae C. Oh
>               315 Alumni Hall
>               Department of Computer Science
>               The University of Pittsburgh
>               Pittsburgh, PA 15260
> 
>                 Office: 315AL 624-8456
>                 WWW - http://www.cs.pitt.edu:80/~joh/
> 
> 
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