Observer Command
diffuse4 variable percentage

Makes each patch give 1/4 of percentage of variable to each non-diagonal (N,E,S,W) neighboring patch.
Percentage should be expressed as a number between 0 and 1. Variable should be a patch variable. Note: diffuse4 must be run by the observer, even though it affects patches.

Examples:

diffuse food 20 causes each patch to give 1/4 of 20 percent of the variable food to each of its four directly-neighboring patches.

Related commands:
diffuse nsum nsum4