uchicago.src.repastdemos.enn
Class EnnModel

java.lang.Object
  uchicago.src.sim.engine.SimModelImpl
      uchicago.src.repastdemos.enn.EnnBase
          uchicago.src.repastdemos.enn.EnnModel

All Implemented Interfaces:

DescriptorContainer, SimEventProducer, SimModel

public class EnnModel
extends EnnBase

A partial implementation of Randal Picker's Endogenous Neighborhood game as described in his as yet unpublished "Endogenous Neighborhoods and Norms." This simulation extends prior work by Randal Picker. See "Simple Games in a Complex World: A Generative Approach to the Adoption of Norms", 64 University of Chicago Law Review 1225 (1997). Thanks to Randal Picker for allowing us to include this with Repast. Here agent's play a coordination game with their neighbors and receive a payoff. After all agents have have played the game, then each agents determines whether the current location and strategy meet their aspiration, changing strategies and moving if necesary. As described in the paper, satisfied agents can play a strategy of "strategy upgrade" or "pure aspiration". Here only strategy upgrade is implemented. Playing this strategy means that a content agent finds the best average strategy of all its neighbors and plays this the next turn. Unsatisfied agents can have a strategy of either move and change or change first. A strategy of move and changes means that an agent moves a random distance in a random direction and then changes its stratgey to the best average strategy of all its neighbors. Change first means that an agent changes its strategy and then if still unsatisfied, changes to a move and change strategy the next turn.

These values can be changed as initial parameters before a run
. PURE_ASPIRATION = 0
STRATEGY_UPGRADE = 1
CHANGE_FIRST = 2
MOVE_AND_CHANGE = 3
See the playGame method of EnnAgent for the details of the strategies.
See SugarModel.java for more on the general structure of a simulation model file.

Version:

$Revision: 1.1 $ $Date: 2005/08/12 20:04:51 $

Author:

Nick Collier and Randal Picker

Field Summary

Fields inherited from class uchicago.src.repastdemos.enn.EnnBase

agentList, aspiration, bValue, DO_LOAD_GUI, DONT_LOAD_GUI, gridDensity, happyPlay, leftPercent, loadGui, recorder, schedule, shuffle, space, unhappyPlay, WORLD_X_SIZE, WORLD_Y_SIZE

Fields inherited from class uchicago.src.sim.engine.SimModelImpl

descriptors, modelManipulator

Constructor Summary

EnnModel()

Method Summary

void	begin() Begins a simulation run.
java.lang.String	getName() Gets the name of the model/simulation.
Schedule	getSchedule() Gets the Schedule created by the model.
protected void	initDataRecorder()
static void	main(java.lang.String[] args)
void	setup() Prepares a model for a new run, typically by deallocating objects or setting them to some reasonable default.

Methods inherited from class uchicago.src.repastdemos.enn.EnnBase

buildModel, computeOAC, computeOSWA, computeRave, getAspiration, getBValue, getDoShuffle, getGridDensity, getHappyPlay, getInitParam, getLoadGui, getPercentLeft, getUnhappyPlay, setAspiration, setBValue, setDoShuffle, setGridDensity, setHappyPlay, setLoadGui, setPercentLeft, setUnhappyPlay

Methods inherited from class uchicago.src.sim.engine.SimModelImpl

addPropertyListener, addSimEventListener, clearMediaProducers, clearPropertyListeners, fireBooleanPropertyEvent, fireEndSim, fireNumericPropertyEvent, fireObjectPropertyEvent, firePauseSim, fireSimEvent, fireStopSim, fireStringPropertyEvent, generateNewSeed, getController, getMediaProducers, getModelManipulator, getParameterDescriptors, getPropertiesValues, getRngSeed, getTickCount, pause, registerDisplaySurface, registerMediaProducer, removePropertyListener, removeSimEventListener, setController, setRngSeed, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EnnModel

public EnnModel()

Method Detail

initDataRecorder

protected void initDataRecorder()

Specified by:

initDataRecorder in class EnnBase

begin

public void begin()

Description copied from interface: SimModel

Begins a simulation run. All initialization, building the model, diplay, etc. should take place here. This method is called whenever the start button (or the step button if the run has not yet begun) is clicked. If running in batch mode this is called to kick off a new simulation run.

setup

public void setup()

Description copied from interface: SimModel

Prepares a model for a new run, typically by deallocating objects or setting them to some reasonable default. Called whenever the setup button is clicked or if operating in batch mode whenever a single run has ended in preparation for the next. Also called when the model is first loaded.

getSchedule

public Schedule getSchedule()

Description copied from interface: SimModel

Gets the Schedule created by the model.

Specified by:

getSchedule in interface SimModel

Overrides:

getSchedule in class EnnBase

Returns:

the schedule created by the model

getName

public java.lang.String getName()

Description copied from interface: SimModel

Gets the name of the model/simulation.

Specified by:

getName in interface SimModel

Overrides:

getName in class EnnBase

Returns:

the name of the model/simulation

main

public static void main(java.lang.String[] args)