Tracking population vs agent level attributes in Agents.jl

Specific Domains Modelling & Simulations
2

Welcome @amynang !

Global variables are generally speaking bad practice for performant code, but in Agents.jl a “global” variable is most naturally represented as a model property. In this way, during any collision you simply increment this model property. For example, as in Schelling model in our docs, if you have the model properties

properties = Dict(:total_collisions => 0)

then inside your agent stepping function and/or the model stepping function you can do:

function agent_step!(agent, model)
    if collision
        model.total_colisions += 1
    end
end
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