Diffusion

Implementing diffusions

GAMA provides you the possibility to represent and simulate a diffusion through a grid topology.

Index

• Diffusion statement
• Diffusion with matrix
• Diffusion with parameters

Diffusion statement

The statement to use for the diffusion is diffusion. It has to be used in a grid species. The diffusion uses the following facets:

• var : the name of the variable that will be diffused through the grid. This variable has to be declared as an attribute of the grid.
• on : the list of agents (usually the entire grid) where the diffusion will occur.
• cycle_length(int) : the number of diffusion operation applied in one simulation step.
• mask(matrix): a matrix masking the diffusion (matrix created from a image for example)

cycle_length (int): the number of diffusion operation applied in one simulation step mask (matrix): a matrix masking the diffusion (matrix created from a image for example) mat_diffu (matrix): the diffusion matrix (can have any size) method (an identifier), takes values in: {convolution, dot_product}: the diffusion method proportion (float): a diffusion rate radius (int): a diffusion radius