Hi All,

Thanks for keep on reading.

I have found what I was looking for on this thread: The "nil" GPType in GPNodeConstraints. I am indeed trying to add the constraints that my model needs and I'm coming across some troubles.

Let me contextualize the problem. I'm generating a tree of AND and OR non-terminal nodes and a RULE-function as terminal nodes. I want to add some constrains so the generated tree follows this two rules:
 1) The root of the tree must be an AND function.
 2) At least one of the childs of the non-terminal nodes must be or a terminal-node (RULE) or an AND node.

I'm trying to add the described constrains like this:

First, I define the GPTypes as follows:

gp.type.a.size = 4 = nil   # This one might not be necessary = rule = and = or
gp.type.s.size = 0

To fulfill 1) I added the follow tree constrain: = and

To fulfill 2) I added the follow node constrains: = 10
#--------------------# = = ncAND = and = 2 = rule = or
#--------------------# = = ncRULE = rule = 0
#--------------------# = = ncOR = or = 2 = rule = and

Then I add each constrains to the functions of the function set:

gp.fs.0.func.0 = = ncOR

gp.fs.0.func.1 = = ncRULE

gp.fs.0.func.2 = = ncAND

Note that with this constrains I am being more restrictive that what I have defined in 2), and actually it doesn't work because, as it is obvious, it never finish due there is always a non-terminal node as child in and The problem here is that I need and to be some times AND and some others RULE, so the GP program will eventually finish.

And I will like to set and some times to RULE and some others to AND to fully satisfy 2)

Is there any way? How can I do such things.

Thanks in advance.

On Tue, Dec 15, 2009 at 10:08 AM, alibaba <[log in to unmask]> wrote:


First of all, thanks for reading.

I need to add some Constraints to my GP program so each function that I have can only accept a specific subset of children. For this, should specify this on the params files or I have to add some checks on the checkConstraints method for each GPNode.

Does anybody know an example on the web about this that I can follow?

Thanks in advance.