; Simple demonstration of a multi-agent system ; for Nigel Gilbert and Klaus G. Troitzsch ; Simulation for the Social scientist, 2nd edition, ; Open University Press ; ; This is the simplest version ; Remove the ";" at the beginning of the commented lines ; in order to obtain the more complicated versions breeds [ agents shops ] agents-own [ shopping-list memory ] shops-own [ product ] globals [ tick products ] to setup locals [ product-number ] clear-all ; background: make all the patches white ask patches [ set pcolor white ] ; products set products ["beans" "chocolate" "soap" "bread" "toothpaste" "milk" "apples" "cake" "oranges" "butter" " peas" "beer"] ; shoppers set-default-shape agents "person" create-custom-agents 10 [ ; locate the agent at a random position setxy (random screen-size-x) - screen-edge-x (random screen-size-y) - screen-edge-y ; set the colour etc. of the shape on the screen set color pink set heading 0 set size 3 ; give it a list of products to buy set shopping-list n-values 10 [ item (random (length products)) products] set memory [] ] ; shops set-default-shape shops "box" set product-number 0 create-custom-shops 12 [ setxy (random screen-size-x) - screen-edge-x (random screen-size-y) - screen-edge-y set color black set heading 0 set size 2 set product item product-number products set product-number product-number + 1 ] end to go ask agents [ act ] if count agents with [ not empty? shopping-list ] = 0 [ stop ] set tick tick + 1 end to act ; if any? other-agents-here [ talk ] if not empty? shopping-list [ shop ] end to talk locals [ partner ] set partner random-one-of other-agents-here remember memory-of partner ask partner [ remember memory ] end to shop locals [ closest-shop-i-know ] ; remember products-on-sale-around-here if any? shops-here [ buy-if-needed ] ; set closest-shop-i-know scan-memory ; ifelse closest-shop-i-know != "None" ; [ move-towards closest-shop-i-know ] ; [ move-randomly ;] end to remember [ shop-locations ] set memory remove-duplicates sentence memory shop-locations end to-report products-on-sale-around-here report values-from (shops-on neighbors) [ (list product xcor ycor) ] end to buy-if-needed locals [ shop-to-buy-from ] set shop-to-buy-from random-one-of shops-here if member? product-of shop-to-buy-from shopping-list [ set shopping-list remove product-of shop-to-buy-from shopping-list ] end to-report scan-memory locals [ shops-to-visit ] set shops-to-visit filter [ member? (first ?) shopping-list ] memory ifelse empty? shops-to-visit [ report "None" ] [ report first (sort-by [ distancexy (last butlast ?1) (last ?1) < distancexy (last butlast ?2) (last ?2) ] shops-to-visit) ] end to move-towards [ shop-location ] if not (xcor = (last butlast shop-location) and ycor = (last shop-location)) [ set heading towardsxy (last butlast shop-location) (last shop-location) move ] end to move-randomly set heading (random 360) move end to move forward 1 end @#$#@#$#@ GRAPHICS-WINDOW 321 10 646 356 17 17 9.0 1 10 1 1 1 0 CC-WINDOW 5 370 655 465 Command Center BUTTON 40 53 106 86 NIL setup NIL 1 T OBSERVER T NIL BUTTON 144 54 207 87 NIL go T 1 T OBSERVER T NIL MONITOR 41 113 98 162 NIL tick 0 1 MONITOR 140 113 290 162 Mean items still to buy mean values-from agents with [ not empty? shopping-list ][ length shopping-list ] 1 1 @#$#@#$#@ WHAT IS IT? ----------- This section could give a general understanding of what the model is trying to show or explain. HOW IT WORKS ------------ This section could explain what rules the agents use to create the overall behavior of the model. HOW TO USE IT ------------- This section could explain how to use the model, including a description of each of the items in the interface tab. THINGS TO NOTICE ---------------- This section could give some ideas of things for the user to notice while running the model. THINGS TO TRY ------------- This section could give some ideas of things for the user to try to do (move sliders, switches, etc.) with the model. EXTENDING THE MODEL ------------------- This section could give some ideas of things to add or change in the procedures tab to make the model more complicated, detailed, accurate, etc. NETLOGO FEATURES ---------------- This section could point out any especially interesting or unusual features of NetLogo that the model makes use of, particularly in the Procedures tab. It might also point out places where workarounds were needed because of missing features. RELATED MODELS -------------- This section could give the names of models in the NetLogo Models Library or elsewhere which are of related interest. CREDITS AND REFERENCES ---------------------- This section could contain a reference to the model's URL on the web if it has one, as well as any other necessary credits or references. @#$#@#$#@ default true 0 Polygon -7566196 true true 150 5 40 250 150 205 260 250 ant true 0 Polygon -7566196 true true 136 61 129 46 144 30 119 45 124 60 114 82 97 37 132 10 93 36 111 84 127 105 172 105 189 84 208 35 171 11 202 35 204 37 186 82 177 60 180 44 159 32 170 44 165 60 Polygon -7566196 true true 150 95 135 103 139 117 125 149 137 180 135 196 150 204 166 195 161 180 174 150 158 116 164 102 Polygon -7566196 true true 149 186 128 197 114 232 134 270 149 282 166 270 185 232 171 195 149 186 Polygon -7566196 true true 225 66 230 107 159 122 161 127 234 111 236 106 Polygon -7566196 true true 78 58 99 116 139 123 137 128 95 119 Polygon -7566196 true true 48 103 90 147 129 147 130 151 86 151 Polygon -7566196 true true 65 224 92 171 134 160 135 164 95 175 Polygon -7566196 true true 235 222 210 170 163 162 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