Wolf-sheep to use create_agent

[quaquel]

This updates the wolf sheep example to use create_agents for wolves and sheep. It also showcases how we can easily sample cells from a cell collection.

I have deliberately not touched grass patched. It is possible to rewrite this to use create_agent, but to make this nice and clean requires a few more changes. Moreover, ideally, this should be rewritten to use a property layer for grass anyway.

[EwoutH]

Looks good! Could you use keyword arguments for clarity?

[quaquel]

Looks good! Could you use keyword arguments for clarity?

see the update and let me know which you prefer

[EwoutH]

Thanks, I think this helps.

Do you know why the tests fail?

FAILED tests/test_examples.py::test_wolf_sheep - ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

[quaquel]

Do you know why the tests fail?

I have a hunch, but will be tonight most likely before I have time again. I'll get it fixed then

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🟢 -4.8% [-6.4%, -3.3%]	🔵 +1.2% [+1.1%, +1.4%]
BoltzmannWealth	large	🔵 +0.5% [+0.0%, +0.9%]	🔵 +0.8% [-0.1%, +1.6%]
Schelling	small	🔵 +1.1% [+0.7%, +1.4%]	🔵 +0.5% [+0.4%, +0.7%]
Schelling	large	🔵 +1.2% [+0.9%, +1.5%]	🔵 -0.4% [-1.4%, +0.7%]
WolfSheep	small	🔴 +3.8% [+3.3%, +4.2%]	🔵 -2.3% [-4.0%, -0.7%]
WolfSheep	large	🔵 +1.4% [+0.8%, +2.0%]	🔵 +0.6% [-0.1%, +1.2%]
BoidFlockers	small	🔵 +1.7% [+1.1%, +2.2%]	🔵 -0.3% [-0.9%, +0.3%]
BoidFlockers	large	🔵 +2.3% [+0.9%, +4.0%]	🔵 -0.7% [-1.2%, -0.3%]

[EwoutH]

Thanks!