Agent goal-list demo

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Ahdekker Anthony Dekker (Author)
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Tagged by Anthony Dekker almost 11 years ago

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Model was written in NetLogo 5.0.3 • Viewed 945 times • Downloaded 67 times • Run 0 times
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NETLOGO GOALS EXAMPLE

This example is explained in the tutorial at http://scientificgems.wordpress.com/2014/01/17/agent-goals-in-netlogo-a-list-tutorial/

RUNNING IT

Click SETUP to start. Clicking GO makes each agent execute this list of four goals:

[ "goto" 3 3 "meet" 7 "scatter" "meet" 0 ]

Use NEW-GOAL and ADD-GOALS to add entries on the end of the goal lists.

Comments and Questions

Explanation

This model is associated with a tutorial at http://scientificgems.wordpress.com/2014/01/17/agent-goals-in-netlogo-a-list-tutorial/

Posted almost 11 years ago

new model , want suggestion and guidance

I want to create a model in which there are two populations of customers and providers. customers can request for service and provider fulfill it by accepting request.

Posted almost 11 years ago

reply

Sana, I would tackle that with a global list of requests, which customers add to, and providers fulfil. The requests themselves can be lists, containing relevant details, including references to the customer agent, if needed.

Posted almost 11 years ago
Click to Run Model 

turtles-own [
  id     ;; agent id number or name (usually a copy of "who")
  speed  ;; agent speed in cells per tick
  goal   ;; goal list
]

to setup
  clear-all
  crt 20 [ setxy random-xcor random-ycor
    set speed (0.1 + (random-float (max-agent-speed - 0.1)))
    set size 3
    set id who
    set goal [ "goto" 3 3 "meet" 7 "scatter" "meet" 0 ]
    set label id ]
  reset-ticks
end 

to add-goals
  ask turtles [
    set goal (sentence goal (read-from-string new-goal))
    if (verbose) [ show (fput "goal =" goal) ]
  ]
end 

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; NetLogo code for obeying instructions ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to obey
  if (goal != []) [
    let kind (item 0 goal)
    if-else (kind = "goto") [ if (obey-goto (item 1 goal) (item 2 goal)) [ drop3-goal ] ] [
    if-else (kind = "meet") [ if (obey-meet (item 1 goal)) [ drop2-goal ] ] [
    if-else (kind = "scatter") [ obey-scatter ] [
    obey-unknown kind ] ] ] ]
end 

to drop-goal
  set goal (bf goal)
end 

to drop2-goal
  set goal (bf (bf goal))
end 

to drop3-goal
  set goal (bf (bf (bf goal)))
end 

to obey-unknown [ g ]
  show (list "unknown goal" g)
  drop-goal
end 

to obey-scatter
  let new-x random-xcor
  let new-y random-ycor
  if (verbose) [ show (list "scattering to" new-x new-y) ]
  set goal (sentence (list "goto" new-x new-y) (bf goal))
end 

to-report obey-goto [ x y ]  ;; obey "goto x y" command; report true when achieved
  let d (distancexy x y)
  if-else (d = 0)
    [ if (verbose) [ show (list "already at" x y) ]
      report true ]
    
    [ facexy x y
      if-else (d <= speed)
        [ setxy x y
          if (verbose) [ show (list "have reached" x y) ]
          report true ]
      
        [ fd speed
          report false ] ]
end 

to-report obey-meet [ ag-id ]  ;; obey "meet agent" command; report true when achieved
  let him (one-of (turtles with [ id = ag-id ]))
  
  if-else (him = self)
    [ if (verbose) [ show (list "i am" him) ]
      report true ]
    
    [ face him
      let d (distance him)
      
      if-else (d <= speed)
        [ move-to him
          if (verbose) [ show (list "have met" him) ]
          report true ]
        
        [ fd speed
          report false ] ]
end  

to go
  if (count (turtles with [ goal != []]) = 0) [ stop ]
  ask turtles [ obey ]
  tick
end

There is only one version of this model, created almost 11 years ago by Anthony Dekker.

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