Observer

nsum neighbor-variable patch-sum-variable

Parameters:
neighbor-variable Variable the variable of the neighbor you would like to sum up
patch-sum-variable Variable the variable that should be set to the sum of the neighbors' variables

Description:
For each patch, takes the sum of neighbor-variable from all neighboring patches and places it in patch-sum-variable. Both neighbor-variable and patch-sum-variable should be patch variables.

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.

Notes:
nsum must be run by the observer even though it affects patches.

Related Commands:
diffuse diffuse4 nsum4