; package delivery problem ; by ; Jose M. Vidal breeds [deliverators] ;"The Deliverator stands tall, your [pizza] pie in thirty minutes or you can have it free, ; shoot the driver, take his car, file a class-action suit."--Snow Crash. deliverators-own [dist deliveries steps balance average-cost accepted-package packages helping behavior spoke] ;dist is the total distance the agent has travelled ;deliveries are the set of deliveries left. They are given in [spoke distance] pairs. ;steps is used to keep track of the steps left towards the goal ;balance is a list of the balances (B in the paper). The i'th element refers to who-of agent = i. ;behavior is ; 0 - philanthropic ; 1 - selfish ; 2 - reciprocative ; 3 - individual ; ;I used a variable instead breeds so that I could "ask deliverators". (wish netlogo had breed inheritance) ;The only important name is "depot" patches-own [name] ;max-distance is the variable D in the paper. The maximum length of a spoke. ;delivery-distances is a random list of delivery distances. All agents use these distances. That way ; we can be certain that all agents will travel the same distance. ;spoke-mult is the angle of the spoke ;distance-mult is how much we multiply the distance in order to plot it ;num-asks-multiplier is how many times deliverators try to trade packages. ;num-deliverators ;total-dist travelled by all deliverators globals [max-distance delivery-distances spoke-mult distance-mult num-asks-multiplier num-deliverators total-dist time] ;num-deliveries- deliveries are referred to as "tasks" in the paper. ;num-spokes- is the variable "R" in the paper to setup ca initialize end to initialize set time 1 set max-distance 3 ;This is variable "D" in the paper set spoke-mult 360 / num-spokes set distance-mult 5 set num-asks-multiplier 10 set num-deliverators num-philanthropic + num-selfish + num-reciprocative + num-individual create-custom-deliverators num-philanthropic + num-selfish + num-reciprocative + num-individual [ set-current-plot "Movement" create-temporary-plot-pen "q" + who set-current-plot-pen "q" + who set-plot-pen-color color ifelse (who < num-philanthropic) [ set behavior 0 ] [ ifelse (who < num-philanthropic + num-selfish) [ set behavior 1 ] [ ifelse (who < num-philanthropic + num-selfish + num-reciprocative)[ set behavior 2] [ set behavior 3]]]] set delivery-distances make-list num-deliveries ask deliverators [ set-deliveries set heading 0] ask (patch 0 0) [set name "depot"] print "Setup done." end to update ;turn of the infinity button if set if (count deliverators with [empty? deliveries] = num-deliverators and count deliverators with [name-of patch-here = "depot"] = num-deliverators) [stop] ;agents in the depot exchange-tasks ;Ask all deliverators to move one step, in parallel ask deliverators [ deliver] ;Plot the total distance travelled set-current-plot "Total Distance" set total-dist sum values-from deliverators [dist] plot total-dist ;Plot individual agent distances set-current-plot "Movement" ask deliverators [ set-plot-pen "q" + who plot dist / time] set time time + 1 end ;returns a copy of lst with all the elements randomized. to-report randomize-list [lst] locals [i len num-reps a a-val b] set len length lst set num-reps len * 2 while [i < num-reps] [ set a random len set a-val item a lst set b random len set lst replace-item a lst (item b lst) set lst replace-item b lst a-val set i i + 1 ] report lst end ;Makes a list of len items by cycling over the possible distances of delivery. ;We assume only integer distances are allowed. to-report make-list [len] locals [i lst c] set lst [] set i 0 set c round (max-distance / 2) while [i < len] [ set lst fput c lst set i i + 1 set c (c + 1) mod max-distance + 1] report lst end ;returns a list of (spoke-number, distance) pairs. ;This is the list of deliveries the deliverator will need to make. to-report make-deliveries locals [i res] set res [] while [i < length delivery-distances][ set res fput list (random num-spokes) (item i delivery-distances) res set i i + 1] report randomize-list res end ;agents in the depot exchange tasks ;I had to do this using a double loop because the parallelism introduced synchronization problems. ;without-interruption is not good enough to solve the problems. ;Sandip's papers do not go into the details of how this exchange happens so I had to make some assumptions. to exchange-tasks locals [i j owners traders] ask deliverators with [name-of patch-here = "depot" and not empty? deliveries][ set accepted-package false ;true if agent has accepted a package from someone. If so, he will not try to trade his package away set packages fput (item 1 first deliveries) [] ;A list of distances for the packages Im delivering, the first is my original one set helping [] ;A list of who-of for the agents for whom agent has agreed to take a package set spoke first first deliveries ] set owners values-from deliverators with [name-of patch-here = "depot" and (not empty? deliveries) ] [who] set owners randomize-list owners while [not empty? owners][ set i (turtle first owners) if (not accepted-package-of i and ;If i has not accepted a package then it can still try to give his away. behavior-of i != 3)[ ;individual agents don't ask for help set traders values-from deliverators with [name-of patch-here = "depot" and not empty? packages and ;deliveries and laura who != who-of i and spoke = spoke-of i] [who] ;laura ;first first deliveries = first first deliveries-of i] [who] laura while [not empty? traders][ set j (turtle first traders) ask i [ try-to-give-next-task-to-agent j] ifelse (empty? packages-of i)[ ;if I gave it then Im done set traders [] ] [ set traders butfirst traders] ] ] ask i [ if (not empty? packages) [ set steps max packages set heading (first first deliveries) * spoke-mult set deliveries but-first deliveries] ] set owners butfirst owners ] end ;reports the agent's cost for doing all delivrs to-report get-costs-from [delivrs] locals [res] set res [] while [not empty? delivrs][ set res lput (item 1 first delivrs * 2) res set delivrs butfirst delivrs] report res end ;Report the extra cost that agnt will incurr if it accepts task, given its current task (first deliverables) ;This method is explained in the 1996 paper. to-report extra-cost [agnt task-dist task-spoke] if (spoke-of agnt != task-spoke)[ ;laura first first deliveries-of report 0] ;only report cost if they are both on the same fin ifelse (task-dist <= first packages-of agnt)[ ;item 1 first deliveries-of laura report task-dist] ;if task is closer than mine then cost is just cost to get there [ report 2 * task-dist - first packages-of agnt] ;if task is farther than mine end ;;;;;; ; Member functions for the Deliverators. ;;;;;; ;Initialize the agent's deliveries. to set-deliveries locals [i] set deliveries make-deliveries set average-cost mean get-costs-from deliveries set steps 0 set balance [] while [i < num-deliverators][ set i i + 1 set balance lput 0 balance] end ;returns true if I am willing to take the next task from ag ;It implements eq.1 from the paper to-report willing-to-take-next-task-from [ag] locals [extra-cost his-task prob] ; C_{ij}^{kl} from the paper report true ;philantropic behavior print "here" set his-task first deliveries-of ag set extra-cost max list 0.0 (item 1 his-task - item 1 first deliveries) set prob 1.0 / (1.0 + exp ((extra-cost - beta * average-cost - item (who-of ag) balance)/ tau)) ; type "Prob of " ; type who ; type " taking from " ; type who-of ag ; type " is " ; print prob if (random 1.0 <= prob)[ report true] report false end to-report reciprocating-agent-accepts-my-next-task? [ag] locals [his-extra-cost his-task prob] ; C_{ij}^{kl} from the paper ;set his-task first deliveries-of ag set his-extra-cost extra-cost ag first packages spoke set prob 1.0 / (1.0 + exp ((his-extra-cost - beta * average-cost-of ag - item who (balance-of ag))/ tau)) if (random 1.0 <= prob)[ report true] report false end to give-my-next-task-to-agent [to-agent] locals [his-extra-cost task] ; type who ; type " giving package to " ; print who-of to-agent ;set task first deliveries ;the task I am giving to-agent set his-extra-cost extra-cost to-agent first packages spoke set (packages-of to-agent) lput (first packages) (packages-of to-agent) ; type "packages =" ; print (packages-of to-agent) set (accepted-package-of to-agent) true set (helping-of to-agent) lput who (helping-of to-agent) set (balance-of to-agent) replace-item who (balance-of to-agent) ((item who balance-of to-agent) - his-extra-cost) set balance replace-item (who-of to-agent) balance ((item (who-of to-agent) balance) + (2 * first packages)) ;update my balance of him..nice guy. set deliveries butfirst deliveries set packages [] end ;Assumes that the next task for me and ag is on the same spoke. to try-to-give-next-task-to-agent [ag] locals [my-cost his-cost] if (empty? packages-of ag) [print "empty" stop] ;if ag already gave away its package then we will not give it to him if (behavior-of ag = 1 or behavior-of ag = 3)[ ;selfish or individuals do not accept packages stop] set my-cost 2 * first packages if (my-cost > extra-cost ag first packages spoke)[ ;as per the 1996 paper ifelse (behavior-of ag = 0)[ ;philanthropic give-my-next-task-to-agent ag] [ ;reciprocating if (reciprocating-agent-accepts-my-next-task? ag)[ give-my-next-task-to-agent ag]]] end to deliver locals [willing-to-help] if (empty? packages and name-of patch-here = "depot") [ ;nothing to deliver stop] if (steps = 0)[ ;at delivery site, turn around set heading heading + 180 set packages [] ] fd distance-mult set dist dist + 1 set steps steps - 1 end @#$#@#$#@ GRAPHICS-WINDOW 246 10 561 325 17 17 9.0 1 10 0 0 CC-WINDOW 245 326 560 446 Command Center BUTTON 2 17 83 50 NIL setup NIL 1 T OBSERVER BUTTON 84 17 165 50 NIL update NIL 1 T OBSERVER BUTTON 165 17 246 50 NIL update T 1 T OBSERVER SLIDER 2 182 174 215 num-deliveries num-deliveries 0 500 20 1 1 NIL SLIDER 2 215 174 248 num-spokes num-spokes 1 20 4 1 1 NIL SLIDER 2 248 174 281 tau tau 0 1 0.75 0.01 1 NIL SLIDER 2 281 174 314 beta beta 0 1 0.5 0.01 1 NIL MONITOR 561 10 696 59 distance total-dist 0 1 PLOT 561 58 761 208 Total Distance x dist 0.0 10.0 0.0 10.0 true false SLIDER 2 83 182 116 num-philanthropic num-philanthropic 0 100 0 1 1 NIL SLIDER 2 50 174 83 num-selfish num-selfish 0 100 0 1 1 NIL SLIDER 2 116 181 149 num-reciprocative num-reciprocative 0 100 20 1 1 NIL SLIDER 2 149 174 182 num-individual num-individual 0 100 0 1 1 NIL PLOT 562 208 762 358 Movement NIL ratio 0.0 10.0 0.0 1.0 true false @#$#@#$#@ Name: email: ID: I understand that it is the responsibility of every member of the Carolina community to uphold an maintain the academic standards and integrity of the University of South Carolina. Any member of the University community, who has reasonable grounds to believe that an infraction of the Code of Student Academic Responsibility has occurred, has an obligation to report the alleged violation. I certify that I have neither given nor received unauthorized aid on this problem set. @#$#@#$#@ default true 0 Polygon -7566196 true true 150 5 40 250 150 205 260 250 arrow true 0 Polygon -7566196 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150 box true 0 Polygon -7566196 true true 45 255 255 255 255 45 45 45 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 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 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 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-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 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 circle false 0 Circle -7566196 true true 35 35 230 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 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 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 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 46 130 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 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 149 186 128 197 114 232 134 270 149 282 166 270 185 232 171 195 149 186 149 186 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 Polygon -7566196 true true 270 14 Polygon -7566196 true true 276 21 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 @#$#@#$#@ NetLogo 1.1 (Rev D) @#$#@#$#@ @#$#@#$#@ @#$#@#$#@