Swarm Tutorial

Dietschy Pj

Description

Swarm Sugar S cape as a Starting PointPaul E . J ohnsonDept o f Political Sc ienceU niversity o f K ansasPrepared fo r Ecological So ciety of Am erica, 2004Plan fo r SSS Tutorial• Modified Suzuk i m ethod:– Run/Study exa mples– Tinker w ith exa mples– Ho pe th eory/f ramework w ill p ercolate up• Go al is to de velop a ppreciation fo r m odel building fro m the “b ottom up ”.• Defer di scussion o f Sw arm installation to smaller p latform-specific g roupsPresentation linked to Handoutsfile-line n umbered h andouts a re cited i n this •presentation• Av ailable o nline a s: sss-2.2-Handouts.tar.g z• Original Sug arscape m odel p resented i n famous b ook by Epstein & Ax tell, Growing Artificial S ocieties (MIT Press, 1996)Begin w ith Swarm Sugarscape • St ep by step [0-sss-shell1 .txt]–Download a “tarball” [0 -001]–U npack it w ith ta r and gz ip [0 -013]–C ompile w ith: [0 -046]make–Run w ith: ./sss [0-127]–see “ screenshots” sss-1.png, sss-2.pngStudy File La yout• Paired “*h ” a nd “*m ” files• “h” is a “h eader fi le” containing:–A class declaration–A list o f variables (aka: instance va riables, IV ARS)–A list o f methods• “m” is the “i mplementation file”, where the methods a re fully w ritten o ut.Study File Lay out #2Makefile [1 1]•–used by “make” program to ...

Informations

• Publié par: Vuin
• Nombre de lectures: 15
• Langue: English

Extrait

Swarm Sugar Scape as a Starting Point

Paul E. Johnson

Dept of Political Science

University of Kansas

Prepared for Ecological Society of America, 2004

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Plan for SSS Tutorial

Modified Suzuki method:

– Run/Study examples

–Tinker with examples

–Hope theory/framework will percolate up

Goal is to develop appreciation for model building from the “bottom up”.

Defer discussion of Swarm installation to smaller platform-specific groups

Presentation linked to Handouts

• file-line numbered handouts are cited in this presentation

•Available online as:

 sss-2.2-Handouts.tar.gz

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Original Sugarscape model presented in famous book by Epstein & Axtell,Growing Artificial Societies(MIT Press, 1996)

Begin with Swarm Sugarscape

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Step by step [0-sss-shell1.txt]

–  [0-001]Download a “tarball”

– [0-013]Unpack it with tar and gzip

–Compile with: [0-046]

make

th:

– Run with:

 

–

./sss [0-127]

creenshots” sss-1.png, sss-2.png

see “screenshots” sss-1.png, sss-2.png

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Study File Layout

Paired “*h” and “*m” files

“h” is a “header file” containing:

– A class declaration

– A list ofvariables

A list ofvariables

(aka: instance variables, IVARS)

fmethods

– A list ofmethods

“m” is the “implementation file”, where the methods are fully written out.

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Study File Layout #2

Makefile [11]

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used by “make” program to manage compiling (compile=convert text into an executable program)

README [1]

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comments from authors

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Study File Layout #3

main.m [2]

– only file actually required in order to

only file actually required in order to have a program because it has the “main” function in it.

– Th

The function “main” [2-011] is the one that the system runs when you start the program. It orchestrates everything else.

–// means “comment” • same as /* comment */

–If this were written in C, it would be “main.c”

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What does main do?

initSwarm() [2-015]

– a big, multi-purpose function called from

a big, multi-purpose function called from the Swarm library. Does much work behind the scenes.

create observerSwarm [2-017]

which is then told to: [2-019]

–buildObjects (create “things” for the simulation)

– buildActions (scheduling framework)

– activateIn (places observer's schedu

activateIn (places observer's schedule into context)

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Note Objective-C syntax

Message: brackets [ ] indicate an object or Class is sent a message

returnValue = [messageReceiver

 theMessage: anArgument];

• returnValue = [messageReceiver

 messageArg1: argument1

 arg2: argument2 ];

•[fred getGroceriesMeat: steak Fish: cod];