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