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I set a base weight of 10 and applied the diffusivity value to the weights attached to moving the particle from its current position.
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This PR adds a "diffusivity" to the model--a weight, favoring remaining in place, to the random displacement of a particle in a time step. The diffusivity is a model parameter set in the configuration file. It's a positive integer. Increasing the value of this "diffusivity" decreases the chance of a particle staying in place.
To use weights, I'm using random.choices instead of random.choice.