#NETLOGO ROUND PATCH#
#NETLOGO ROUND CODE#

If at least one exists, the cop randomly selects one active agent and sends it to jail for a number of turns between 0 and MAX-JAIL-TERM (settable by a slider in the interface) and moves to the patch of the jailed agent. (It is also possible for the agent to move from rebellion to quiet, in which case the border color changes from red to blue.)Д¬op rule C says that each cop should look for active agents within VISION patches. This is noted by changing the agent's border color from blue to red. Movement rule M says that each cop and non-imprisoned agent moves to a random unoccupied site within VISION patches.ДЄgent rule A says that if an agent's GRIEVANCE exceeds the NET-RISK by a small threshold (set by default to 0.1 in 'setup'), the agent decides to rebel. The model cycles through three different rules, known as M (move), A (agents) and C (cops): In other words, the rule could be written more simply as: ifelse A > C ДЄn agent's NET-RISK is the product of the calculated ESTIMATED-ARREST-PROBABILITY and RISK-AVERSION randomly set for each agent at birth. The effect of the change is that if there are more rebels than cops in the neighborhood, the probability of arrest is zero, otherwise it is very nearly 1.0. Without this change, the model does not exhibit punctuated equilibrium. After dividing by C by A, we take the 'floor' of the result (that is, round downwards to an integer). In our implementation, we changed one aspect of Epstein's description.

This ESTIMATED-ARREST-PROBABILITY, is based on the number of cops and already rebelling agents within VISION patches, namely 1 - exp (- k * (C/A) v) - where (C/A) v is the ratio of cops to active agents, and k is a constant set in 'startup' to ensure a reasonable value when there is only one cop and one agent within a particular field of vision. GRIEVANCE is based on the agent's PERCEIVED-HARDSHIP, which is assigned randomly at startup, and on GOVERNMENT-LEGITIMACY, which is global across agents and specified by a slider in the interface.Д®ach agent also calculates an individual risk of rebelling at the beginning of each turn. HOW IT WORKSД®ach 'agent,' or member of the general population, has an individual level of grievance toward the central authority. The cops wander around randomly and arrest people who are actively rebelling. A separate population of police officers ('cops'), acting on behalf of the central authority, seeks to suppress the rebellion. If their level of grievance against the central authority is high enough, and their perception of the risks involved is low enough, they openly rebel. It is is an adaptation of Joshua Epstein's model of civil violence (2002). This project models the rebellion of a subjugated population against a central authority.

#NETLOGO ROUND CODE#

Either way, the next code always runs.Do you have questions or comments about this model? An if clause runs the code if the if condition is satisfied and skips over it if not satisfied. The way you had it written, drawing a number like 3 would have added 1 (as <50) then another 2 (as <10) then another 3 (as <5) for a total increase of 6. Note that I changed all your + amounts to + 1. If (%draw-change < 1) 4 complete eco loss Set economic economic + 1 all get some eco loss Let n-changers round (%draw-prop * count turtles) + 1 +1 so at least one changes It would be easier to have the var_change procedure both select the turtles to change and assign the amount of change. The way you have it set up, all turtles are sent to the var_change procedure.

Netlogo round