Turtle and Observer Command
sum-of-patches-with `[condition] [list of commands]` Reports the total value of `[list of commands]` when run over the turtles that satisfy the `condition`. If there are no patches in which `condition` is true, it reports 0. Note: This command can also be executed by patches, for example within an `ask-patches` statement. Examples: `sum-of-patches-with [pc = green or pc = blue] [density]` returns the sum of the densities of all patches which are blue or green. Related commands: sum-of-patches