nsum variable1 variable2
For each patch, takes the sum of variable1 from all neighboring
patches and places it in variable2 .
Variable
should be a patch variable.
Note:
nsum must be run by the observer, even though it affects patches.
Examples:
nsum food surrounding-food takes the food variable of all
the surrounding patches and stores the value of their sum in the patch-variable
surrounding-food.
Related commands:
nsum4 diffuse
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