NetLogo Models Library:
This model is a simple cellular automaton that simulates voting distribution by having each patch take a "vote" of its eight surrounding neighbors, then perhaps change its own vote according to the outcome.
Click the SETUP button to create an approximately equal but random distribution of blue and green patches. Click GO to run the simulation.
When both switches are off, the central patch changes its color to match the majority vote, but if there is a 4-4 tie, then it does not change.
If the CHANGE-VOTE-IF-TIED? switch is on, then in the case of a tie, the central patch will always change its vote.
If the AWARD-CLOSE-CALLS-TO-LOSER? switch is on, then if the result is 5-3, the central patch votes with the losing side instead of the winning side.
Watch how any setup quickly settles to a static state when both switches are off.
Watch what happens when only the CHANGE-VOTE-IF-TIED? switch is on. How is the result different?
Watch what happens when only the AWARD-CLOSE-CALLS-TO-LOSER? switch is on. How is the result different?
What happens when both switches are on?
Try other voting rules.
Start with a nonrandom green-and-blue pattern. For example, one could make half of the world blue and half green.
Can you enhance the model to incorporate multiple colors and multiple votes? One might interpret shades of color to represent the degree of a patch's opinion about an issue: strongly against, against, neutral, etc. Each patch could have more than two choices and weighted votes: blue patches' vote could count twice, etc.
Ising (a physics model, but the rules are very similar)
This model is described in Rudy Rucker's "Artificial Life Lab", published in 1993 by Waite Group Press.
If you mention this model or the NetLogo software in a publication, we ask that you include the citations below.
For the model itself:
Please cite the NetLogo software as:
Copyright 1998 Uri Wilensky.
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License. To view a copy of this license, visit https://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
Commercial licenses are also available. To inquire about commercial licenses, please contact Uri Wilensky at email@example.com.
This model was created as part of the project: CONNECTED MATHEMATICS: MAKING SENSE OF COMPLEX PHENOMENA THROUGH BUILDING OBJECT-BASED PARALLEL MODELS (OBPML). The project gratefully acknowledges the support of the National Science Foundation (Applications of Advanced Technologies Program) -- grant numbers RED #9552950 and REC #9632612.
This model was converted to NetLogo as part of the projects: PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and/or INTEGRATED SIMULATION AND MODELING ENVIRONMENT. The project gratefully acknowledges the support of the National Science Foundation (REPP & ROLE programs) -- grant numbers REC #9814682 and REC-0126227. Converted from StarLogoT to NetLogo, 2001.