; re-implementation of ; ; Wander Jager, Roel Popping and Hans van de Sande (2001) ; Clustering and Fighting in Two-party Crowds: Simulating the Approach-avoidance Conflict ; Journal of Artificial Societies and Social Simulation vol. 4, no. 3, ; ; ; Nigel Gilbert ; 30 August 2003 ; ; for NetLogo 1.3 ; globals [ step ; steps completed (= the simulated time in seconds) ] breeds [ people ] people-own [ acquaintances ; list of 15 people of my party with whom I am acquainted visible-people ; list of all the people that I saw as a result of my last scan number-of-visible-own-party ; number of people of my own party among the visible people number-of-visible-other-party ; number of people of the other party among the visible people quad-own-party ; the quadrant containing the most people of my (the other ... quad-other-party ; party). A heading (45, 135, 225, 315) or zero if no one. aggression ; my aggression motivation score (0 .. 30) party ; my party (red or green) kind ; whether a hardcore, hanger-on or bystander fighting ; number of steps until I stop fighting (0 if I am not fighting) defending ; number of steps until I stop defending myself (or 0 if I am not) ] ; create the agents and give them their initial attributes, acquaintances, location, etc. to setup locals [number-of-hardcore number-of-hangers-on number-of-bystanders ] clear-all ask patches [ set pcolor white ] set number-of-hardcore (population * hardcore-percent / 100) ;hardcore-percent set by slider set number-of-hangers-on (2 * number-of-hardcore) set number-of-bystanders (population - number-of-hardcore - number-of-hangers-on) create-custom-people population [ ifelse who < number-of-hardcore [ set kind "hardcore" ] [ ifelse who < number-of-hardcore + number-of-hangers-on [ set kind "hangers-on" ] [ set kind "bystander" ] ] ifelse asymetrical [ ifelse who mod 4 = 0 [ set party "red" ] [ set party "green" ] ] [ ifelse who mod 2 = 0 [ set party "red" ] [ set party "green" ] ] set-party-color set shape "circle" ; distribute the agents at random over the grid setxy ((random-int-or-float screen-size-x) - screen-edge-x) ((random-int-or-float screen-size-y) - screen-edge-y) set aggression 0 set acquaintances [] set fighting 0 set defending 0 ] ask people [ make-friends scan ] end ; give the agent 15 acquaintances, chosen at random from those of my party. ; Acquaintances are bi-directional. I may already have some, placed here by ; my friends when they made bi-links, so now I must just make up the number to 15 to make-friends locals [ number-to-choose my-party-people friend ] without-interruption [ set number-to-choose 15 - length acquaintances set my-party-people people with [ (party = party-of myself) and (self != myself) ] repeat number-to-choose [ set friend random-one-of my-party-people with [ not member? myself acquaintances ] set acquaintances fput friend acquaintances ; tell my friend that I am its friend set acquaintances-of friend fput self acquaintances-of friend ] ] end ; set the display colour of the turtle to my party colour to set-party-color ifelse party = "red" [ set color red ] [ set color green ] end ; repeatedly executed when the user clicks the 'go' button ; Run 5400 steps and then stop ; For each agent, the process is to look (scan), think (adjust aggression motivation) and act (according to the ; behaviour model) again and again to go set step step + 1 if step > 5400 [ stop ] ask people [ do-one-step ] do-plots end ; top level process for each agent to do-one-step ifelse fighting > 0 or defending > 0 ; either fight (or defend) or scan and behave [ fight ] [ if time-to-scan [ scan adjust-aggression ] behave ] end ; report true if this agent should scan the locality this time step to-report time-to-scan report (kind = "hardcore") or (kind = "hanger-on" and step mod 2 = 0) or (kind = "bystander" and step mod 8 = 0) end ; a fight lasts for 100 steps. Reduce the fight timers by 1, and if the fight has ended ; set the aggressor's aggression to zero. to fight if fighting > 0 [ set fighting fighting - 1 if fighting = 0 [ set aggression 0 ] ] if defending > 0 [ set defending defending - 1 ] end ; adjust the aggression motivation according to how many people of my own and the other ; party I can see. to adjust-aggression set number-of-visible-own-party count visible-people with [ party = party-of myself ] set number-of-visible-other-party count visible-people with [party != party-of myself ] ifelse number-of-visible-own-party > number-of-visible-other-party + 10 [ set aggression aggression + 1] [ if number-of-visible-other-party > number-of-visible-own-party + 10 [ set aggression aggression - 1] ] ifelse aggression < 0 [set aggression 0] [if aggression > 30 [ set aggression 30 ] ] end ; this is the behaviour model. ; Choose different actions according to my level of aggression and whether there is anyone in the ; next door cell that I could fight to behave locals [ opponent acquaintance ] ifelse aggression > 15 [ set color 2 ; approach state set opponent in-direct-contact ifelse opponent != nobody and aggression > 25 ; aggressive state [ start-fighting opponent ] [ ifelse quad-other-party > 0 [ move-to-other-party ] [ behave-with-standard-rule ] ] ] [ set-party-color ; avoidance state ifelse number-of-visible-other-party - number-of-visible-own-party > 10 [ behave-with-standard-rule ] [ set acquaintance see-acquaintance ifelse acquaintance != nobody [ approach-acquaintance acquaintance ] [ ifelse quad-own-party > 0 [ move-to-own-party ] [ behave-with-standard-rule] ] ] ] end ; fight for 100 steps. Fighting people are coloured black to start-fighting [ opponent ] set fighting 100 set color black set defending-of opponent 100 set color-of opponent black end ; an agent is in direct contact with another if they are in adjacent cells ; report an agent of the other party who is an adjacent cell, or nobody if ; there is none, or one at random if there is more than one to-report in-direct-contact report random-one-of (in-moore-range people 1) with [party != party-of myself] end ; the behaviour model for when the agent is not aggressive or approaching to behave-with-standard-rule locals [ random-number ] set random-number (random 100) ifelse random-number < 50 [ move-randomly ] [ ifelse random-number < 95 [ move-in-locality ] [ stand-still ] ] end ; report a randomly chosen one of my acquaintances from all those that I can see ; (i.e. located within a 40 unit square centred on me) to-report see-acquaintance locals [ visible-acquaintances ] set visible-acquaintances filter [abs (pxcor - pxcor-of ?) <= 20 and abs (pycor - pycor-of ?) <= 20] acquaintances ifelse empty? visible-acquaintances [ report nobody ] [ report item (random length visible-acquaintances) visible-acquaintances ] end ; move towards the acquaintance to approach-acquaintance [acquaintance ] set heading towards-nowrap acquaintance move end ; move one unit in a diagonal direction to the quadrant that has most members of my party to move-to-own-party set heading quad-own-party move end ; move one unit in a diagonal direction to the quadrant that has most members of the other party to move-to-other-party set heading quad-other-party move end ; move one unit on a random direction to move-randomly set heading (random-int-or-float 360) move end ; move one unit turning left first. If repeated, this will yield a circular path to move-in-locality left 90 move end ; move one unit in the direction I am heading. If that would bump me into the edge, do an about-turn ; (180 degrees) first ; If the move would mean going into a patch that is already occupied, don't move after all. ; Then ensure that I am in the middle of my patch to move if (xcor + dx < 0 - screen-edge-x) or (xcor + dx > screen-edge-x) or (ycor + dy < 0 - screen-edge-y) or (ycor + dy > screen-edge-y) [ set heading heading + 180 ] if not any? people-at dx dy [ forward 1 ] centre end to stand-still ; do nothing end ; see how many people I can see, looking in the 40 x 40 Moore neighbourhood around me ; Then see in which quadrant there are the most of my own and the other parties to scan set visible-people in-moore-range people 20 set quad-own-party quad party ifelse party = "red" [ set quad-other-party quad "green" ] [ set quad-other-party quad "red" ] end ; report the quadrant in which there are the most members of the-party ; The number returned is either the direction of a diagonal through the quadrant ; (45, 135, 225 or 315) or 0, the latter meaning that there are no people of ; that party visible anywhere to-report quad [ the-party ] locals [ quad1 quad2 quad3 quad4 quad-max ] set quad1 count visible-people with [ party = the-party and xcor >= xcor-of myself and ycor >= ycor-of myself] set quad2 count visible-people with [ party = the-party and xcor >= xcor-of myself and ycor <= ycor-of myself] set quad3 count visible-people with [ party = the-party and xcor <= xcor-of myself and ycor <= ycor-of myself] set quad4 count visible-people with [ party = the-party and xcor <= xcor-of myself and ycor >= ycor-of myself] set quad-max max (list quad1 quad2 quad3 quad4 ) if quad-max = 0 [ report 0 ] ifelse quad1 = quad-max [ report 45 ] [ ifelse quad2 = quad-max [ report 135 ] [ ifelse quad3 = quad-max [ report 225 ] [ report 315 ] ] ] end ; move to the centre of the patch that I occupy at the moment to centre setxy pxcor-of patch-here pycor-of patch-here end ; report an agentset of the agents that are inside the Moore neighbourhood of dimension 2n to-report in-moore-range [agents n] report agents with [abs (pxcor - pxcor-of myself) <= n and abs (pycor - pycor-of myself) <= n] end ; add the results from a step to the plots to do-plots set-current-plot "Clusters with own party" plot mean values-from people [ count in-moore-range people with [ party = party-of myself ] 3 ] end ; end of program @#$#@#$#@ GRAPHICS-WINDOW 391 19 813 462 51 51 4.0 1 10 1 1 1 0 CC-WINDOW 5 507 822 602 Command Center SLIDER 31 82 203 115 population population 0 400 400 1 1 people SLIDER 35 134 207 167 hardcore-percent hardcore-percent 0 5 5 1 1 % SWITCH 40 191 160 224 asymetrical asymetrical 0 1 -1000 BUTTON 37 31 100 64 NIL setup NIL 1 T OBSERVER T NIL BUTTON 138 31 201 64 NIL go T 1 T OBSERVER T NIL PLOT 186 195 386 345 Clusters with own party NIL NIL 0.0 100.0 0.0 100.0 true false MONITOR 253 13 310 62 NIL step 3 1 TEXTBOX 491 469 722 493 Red and Green: the parties. Black: fighting @#$#@#$#@ 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 235 222 210 170 163 162 161 166 208 174 Polygon -7566196 true true 249 107 211 147 168 147 168 150 213 150 arrow true 0 Polygon -7566196 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150 bee true 0 Polygon -256 true false 151 152 137 77 105 67 89 67 66 74 48 85 36 100 24 116 14 134 0 151 15 167 22 182 40 206 58 220 82 226 105 226 134 222 Polygon -16777216 true false 151 150 149 128 149 114 155 98 178 80 197 80 217 81 233 95 242 117 246 141 247 151 245 177 234 195 218 207 206 211 184 211 161 204 151 189 148 171 Polygon -7566196 true true 246 151 241 119 240 96 250 81 261 78 275 87 282 103 277 115 287 121 299 150 286 180 277 189 283 197 281 210 270 222 256 222 243 212 242 192 Polygon -16777216 true false 115 70 129 74 128 223 114 224 Polygon -16777216 true false 89 67 74 71 74 224 89 225 89 67 Polygon -16777216 true false 43 91 31 106 31 195 45 211 Line -1 false 200 144 213 70 Line -1 false 213 70 213 45 Line -1 false 214 45 203 26 Line -1 false 204 26 185 22 Line -1 false 185 22 170 25 Line -1 false 169 26 159 37 Line -1 false 159 37 156 55 Line -1 false 157 55 199 143 Line -1 false 200 141 162 227 Line -1 false 162 227 163 241 Line -1 false 163 241 171 249 Line -1 false 171 249 190 254 Line -1 false 192 253 203 248 Line -1 false 205 249 218 235 Line -1 false 218 235 200 144 bird1 false 0 Polygon -7566196 true true 2 6 2 39 270 298 297 298 299 271 187 160 279 75 276 22 100 67 31 0 bird2 false 0 Polygon -7566196 true true 2 4 33 4 298 270 298 298 272 298 155 184 117 289 61 295 61 105 0 43 boat1 false 0 Polygon -1 true false 63 162 90 207 223 207 290 162 Rectangle -6524078 true false 150 32 157 162 Polygon -16776961 true false 150 34 131 49 145 47 147 48 149 49 Polygon -7566196 true true 158 33 230 157 182 150 169 151 157 156 Polygon -7566196 true true 149 55 88 143 103 139 111 136 117 139 126 145 130 147 139 147 146 146 149 55 boat2 false 0 Polygon -1 true false 63 162 90 207 223 207 290 162 Rectangle -6524078 true false 150 32 157 162 Polygon -16776961 true false 150 34 131 49 145 47 147 48 149 49 Polygon -7566196 true true 157 54 175 79 174 96 185 102 178 112 194 124 196 131 190 139 192 146 211 151 216 154 157 154 Polygon -7566196 true true 150 74 146 91 139 99 143 114 141 123 137 126 131 129 132 139 142 136 126 142 119 147 148 147 boat3 false 0 Polygon -1 true false 63 162 90 207 223 207 290 162 Rectangle -6524078 true false 150 32 157 162 Polygon -16776961 true false 150 34 131 49 145 47 147 48 149 49 Polygon -7566196 true true 158 37 172 45 188 59 202 79 217 109 220 130 218 147 204 156 158 156 161 142 170 123 170 102 169 88 165 62 Polygon -7566196 true true 149 66 142 78 139 96 141 111 146 139 148 147 110 147 113 131 118 106 126 71 box true 0 Polygon -7566196 true true 45 255 255 255 255 45 45 45 butterfly1 true 0 Polygon -16777216 true false 151 76 138 91 138 284 150 296 162 286 162 91 Polygon -7566196 true true 164 106 184 79 205 61 236 48 259 53 279 86 287 119 289 158 278 177 256 182 164 181 Polygon -7566196 true true 136 110 119 82 110 71 85 61 59 48 36 56 17 88 6 115 2 147 15 178 134 178 Polygon -7566196 true true 46 181 28 227 50 255 77 273 112 283 135 274 135 180 Polygon -7566196 true true 165 185 254 184 272 224 255 251 236 267 191 283 164 276 Line -7566196 true 167 47 159 82 Line -7566196 true 136 47 145 81 Circle -7566196 true true 165 45 8 Circle -7566196 true true 134 45 6 Circle -7566196 true true 133 44 7 Circle -7566196 true true 133 43 8 circle false 0 Circle -7566196 true true 35 35 230 person false 0 Circle -7566196 true true 155 20 63 Rectangle -7566196 true true 158 79 217 164 Polygon -7566196 true true 158 81 110 129 131 143 158 109 165 110 Polygon -7566196 true true 216 83 267 123 248 143 215 107 Polygon -7566196 true true 167 163 145 234 183 234 183 163 Polygon -7566196 true true 195 163 195 233 227 233 206 159 sheep false 15 Rectangle -1 true true 90 75 270 225 Circle -1 true true 15 75 150 Rectangle -16777216 true false 81 225 134 286 Rectangle -16777216 true false 180 225 238 285 Circle -16777216 true false 1 88 92 spacecraft true 0 Polygon -7566196 true true 150 0 180 135 255 255 225 240 150 180 75 240 45 255 120 135 thin-arrow true 0 Polygon -7566196 true true 150 0 0 150 120 150 120 293 180 293 180 150 300 150 truck-down false 0 Polygon -7566196 true true 225 30 225 270 120 270 105 210 60 180 45 30 105 60 105 30 Polygon -8716033 true false 195 75 195 120 240 120 240 75 Polygon -8716033 true false 195 225 195 180 240 180 240 225 truck-left false 0 Polygon -7566196 true true 120 135 225 135 225 210 75 210 75 165 105 165 Polygon -8716033 true false 90 210 105 225 120 210 Polygon -8716033 true false 180 210 195 225 210 210 truck-right false 0 Polygon -7566196 true true 180 135 75 135 75 210 225 210 225 165 195 165 Polygon -8716033 true false 210 210 195 225 180 210 Polygon -8716033 true false 120 210 105 225 90 210 turtle true 0 Polygon -7566196 true true 138 75 162 75 165 105 225 105 225 142 195 135 195 187 225 195 225 225 195 217 195 202 105 202 105 217 75 225 75 195 105 187 105 135 75 142 75 105 135 105 wolf false 0 Rectangle -7566196 true true 15 105 105 165 Rectangle -7566196 true true 45 90 105 105 Polygon -7566196 true true 60 90 83 44 104 90 Polygon -16777216 true false 67 90 82 59 97 89 Rectangle -1 true false 48 93 59 105 Rectangle -16777216 true false 51 96 55 101 Rectangle -16777216 true false 0 121 15 135 Rectangle -16777216 true false 15 136 60 151 Polygon -1 true false 15 136 23 149 31 136 Polygon -1 true false 30 151 37 136 43 151 Rectangle -7566196 true true 105 120 263 195 Rectangle -7566196 true true 108 195 259 201 Rectangle -7566196 true true 114 201 252 210 Rectangle -7566196 true true 120 210 243 214 Rectangle -7566196 true true 115 114 255 120 Rectangle -7566196 true true 128 108 248 114 Rectangle -7566196 true true 150 105 225 108 Rectangle -7566196 true true 132 214 155 270 Rectangle -7566196 true true 110 260 132 270 Rectangle -7566196 true true 210 214 232 270 Rectangle -7566196 true true 189 260 210 270 Line -7566196 true 263 127 281 155 Line -7566196 true 281 155 281 192 wolf-left false 3 Polygon -6524078 true true 117 97 91 74 66 74 60 85 36 85 38 92 44 97 62 97 81 117 84 134 92 147 109 152 136 144 174 144 174 103 143 103 134 97 Polygon -6524078 true true 87 80 79 55 76 79 Polygon -6524078 true true 81 75 70 58 73 82 Polygon -6524078 true true 99 131 76 152 76 163 96 182 104 182 109 173 102 167 99 173 87 159 104 140 Polygon -6524078 true true 107 138 107 186 98 190 99 196 112 196 115 190 Polygon -6524078 true true 116 140 114 189 105 137 Rectangle -6524078 true true 109 150 114 192 Rectangle -6524078 true true 111 143 116 191 Polygon -6524078 true true 168 106 184 98 205 98 218 115 218 137 186 164 196 176 195 194 178 195 178 183 188 183 169 164 173 144 Polygon -6524078 true true 207 140 200 163 206 175 207 192 193 189 192 177 198 176 185 150 Polygon -6524078 true true 214 134 203 168 192 148 Polygon -6524078 true true 204 151 203 176 193 148 Polygon -6524078 true true 207 103 221 98 236 101 243 115 243 128 256 142 239 143 233 133 225 115 214 114 wolf-right false 3 Polygon -6524078 true true 170 127 200 93 231 93 237 103 262 103 261 113 253 119 231 119 215 143 213 160 208 173 189 187 169 190 154 190 126 180 106 171 72 171 73 126 122 126 144 123 159 123 Polygon -6524078 true true 201 99 214 69 215 99 Polygon -6524078 true true 207 98 223 71 220 101 Polygon -6524078 true true 184 172 189 234 203 238 203 246 187 247 180 239 171 180 Polygon -6524078 true true 197 174 204 220 218 224 219 234 201 232 195 225 179 179 Polygon -6524078 true true 78 167 95 187 95 208 79 220 92 234 98 235 100 249 81 246 76 241 61 212 65 195 52 170 45 150 44 128 55 121 69 121 81 135 Polygon -6524078 true true 48 143 58 141 Polygon -6524078 true true 46 136 68 137 Polygon -6524078 true true 45 129 35 142 37 159 53 192 47 210 62 238 80 237 Line -16777216 false 74 237 59 213 Line -16777216 false 59 213 59 212 Line -16777216 false 58 211 67 192 Polygon -6524078 true true 38 138 66 149 Polygon -6524078 true true 46 128 33 120 21 118 11 123 3 138 5 160 13 178 9 192 0 199 20 196 25 179 24 161 25 148 45 140 Polygon -6524078 true true 67 122 96 126 63 144 @#$#@#$#@ NetLogo 2.1.0 @#$#@#$#@ @#$#@#$#@ @#$#@#$#@