hierarchy of linked turtles

[Jonathan Brooks]

Hello All,

I'm having trouble figuring out how to get all linked turtles to perform an action. Here is my situation, one turtle is linked to two other turtles. Those two turtles are each linked to two other turtles and so on. This forms a hierarchal tree of linked turtles. What I'm trying to do is get all the turtles in this tree to perform an action. If I ask link-neighbors to perform the action, only the first two levels of the will perform the action. Is there a way to get all linked turtles to perform the action without using a long series of nested ask statements? Thanks.

[Steve Railsback]

You could use "recursion": have one turtle ask its link-neighbors to execute some code that includes asking their link-neighbors to execute the same code.

ask one-of turtles [ move-neighbors ]

to move-neighbors

  fd 1 ; or whatever you want all the linked turtles to do

  ask link-neighbors [ move-neighbors ]

end

But I think you will be happier if you learn to use the built-in Networks extension. It has commands for doing things like this.

Steve R.

[Steve Railsback]

Actually, do not try the recursion approach with "link-neighbors" because it will never stop: two turtles will keep telling each other to execute move-neighbors. It could work with directed links and out-link-neighbors etc.

But use the Network extension.