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This operator implements migration within cellular Eco Lab. This updates density values according to the difference with the 4 nearest neighbours: $\mbox{\boldmath {$n$}}+=\mbox{\boldmath {$\gamma$}}*(0.25(\mbox{\boldmath {$n$}...
...}}_e+\mbox{\boldmath {$n$}}_s+\mbox{\boldmath {$n$}}_w)-\mbox{\boldmath {$n$}})$, where the $n,e,s,w$ index the north, east, south and west neigbouring cells.

Russell Standish 2016-09-02