JuliaDynamics/Agents.jl
add_agent!() adds agents with out-of-bounds coordinates despite BoundsError
Aperta
#1193 aperta il 13 gen 2026
bugdiscretegood first issue
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Descrizione
Describe the bug
When add_agent!() is called with out-of-bounds coordinates on a GridSpace, it throws a BoundsError but still adds the agent to the model's dictionary. This creates an inconsistent state where the agent exists in the model but it has an invalid position. Functions such as nearby_ids() do not return this agent's id. I have not tested with other functions though.
Minimal Working Example
using Agents
@agent struct Customer(GridAgent{2})
age
end
space = GridSpace((100,100); periodic = false, metric = :euclidean)
model = StandardABM(Customer, space)
add_agent!((0,0), model,25) #similar behavior when using negative coordinates
Output:
BoundsError: attempt to access 100×100 Matrix{Vector{Int64}} at index [0, 0]
However when checking the agents in the model the agent has been added
allagents(model)
Output:
ValueIterator for a Dict{Int64, Customer} with 1 entry. Values:
Customer(1, (0, 0), 25)
Agents.jl version
Agents v6.2.10