FW From Simsoc: RE: Sugarscape - the landscape formula

[Paul E. Johnson]

I saw this note on the SimSOC list, and there were no answers,
so I'm hitting the Swarm group.

What formula is used to generate the sugar distribution in Sugarscape?(see
forwarded message below)

The PGM file
included with swarm must have been generated somehow.  Where
from? What formula?
Paul JOhnson
>
>On 23-Feb-98 Nigel Gilbert wrote:
>> Joshua Epstein and Robert Axtell's Growing Artificial Societies
>> (Brookings/MIT, 1996) introduces the "sugarscape", a 50 by 50 cell
>> landsscape in which there is a distribution of "sugar".  Almost all the
>> examples in the book are based on a sugarscape in which there are peaks in
>> the northeast and southwest quadrants of the grid, falling off to zero at
>> the periphery (page 22).
>>
>> Does anyone know what equation Epstein and Axtell used to generate the
>> distribution of sugar on the sugarscape?  The formula
>>
>> sugar = 25 * sin (x-25)/4 * sin (y-25)/4
>>
>> gives nearly the right profile, but visually it appears there is too little
>> sugar at the central point (25,25).
>>
>> With thanks,
>>
>> Nigel Gilbert
>>
>> ____________________________________________________________________
>> Prof G. Nigel Gilbert, Department of Sociology, University of Surrey
>>   Guildford GU2 5XH, UK. Tel: +44 1483 259173 Fax: +44 1483 259551
>>
>>
>
>----------------------------------
>E-Mail: Paul E. Johnson <address@hidden>
>Date: 23-Feb-98
>Time: 09:33:26
>
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>----------------------------------


_________________________________________________________________________
Prof G. Nigel Gilbert, Dept of Sociology, University of Surrey, Guildford
GU2 5XH,
United Kingdom.  Tel: +44 (0)1483 259173 Fax: +44 (0)1483 259551



--------------End of forwarded message-------------------------

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E-Mail: Paul E. Johnson <address@hidden>
Date: 24-Feb-98
Time: 12:56:30

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