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Boltzmann wealth model: Use the new Mesa 2.2 API & some refactors #79

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Boltzmann wealth model: Use the new Mesa 2.2 API & some refactors #79

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26 changes: 13 additions & 13 deletions examples/boltzmann_wealth_model_experimental/model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@


def compute_gini(model):
agent_wealths = [agent.wealth for agent in model.schedule.agents]
agent_wealths = model.agents.get("wealth")
x = sorted(agent_wealths)
N = model.num_agents
B = sum(xi * (N - i) for i, xi in enumerate(x)) / (N * sum(x))
Expand All @@ -19,27 +19,26 @@ class BoltzmannWealthModel(mesa.Model):

def __init__(self, N=100, width=10, height=10):
super().__init__()
self.running = True # TODO remove this line when at Mesa 3.0
self.num_agents = N
self.grid = mesa.space.MultiGrid(width, height, True)
self.schedule = mesa.time.RandomActivation(self)
self.datacollector = mesa.DataCollector(
model_reporters={"Gini": compute_gini}, agent_reporters={"Wealth": "wealth"}
)
# Create agents
for i in range(self.num_agents):
a = MoneyAgent(i, self)
self.schedule.add(a)
# Add the agent to a random grid cell
x = self.random.randrange(self.grid.width)
y = self.random.randrange(self.grid.height)
self.grid.place_agent(a, (x, y))

self.running = True
self.datacollector.collect(self)

def step(self):
self.schedule.step()
# collect data
self.agents.shuffle().do("step")
# Must be before data collection.
self._advance_time() # Temporary API; will be finalized by Mesa 3.0 release
self.datacollector.collect(self)

def run_model(self, n):
Expand All @@ -55,17 +54,18 @@ def __init__(self, unique_id, model):
self.wealth = 1

def move(self):
possible_steps = self.model.grid.get_neighborhood(
possible_positions = self.model.grid.get_neighborhood(
self.pos, moore=True, include_center=False
)
new_position = self.random.choice(possible_steps)
self.model.grid.move_agent(self, new_position)
self.model.grid.move_agent_to_one_of(self, possible_positions)

def give_money(self):
cellmates = self.model.grid.get_cell_list_contents([self.pos])
cellmates.pop(
cellmates.index(self)
) # Ensure agent is not giving money to itself
cellmates = [
c
for c in self.model.grid.get_cell_list_contents([self.pos])
# Ensure agent is not giving money to itself
if c is not self
]
if len(cellmates) > 0:
other = self.random.choice(cellmates)
other.wealth += 1
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