[gecode-users] Creating a function to solve CP sub-problem instances

[Nathan Horvath]

Hi Christian,
I should clarify, when I mention script in my original email, I mean an individual file that solves an instance of my sub-problem given particular data. I want to integrate this with other code of mine so that when the optimal solution is found, it is not just printed to the screen, but ideally stored in a structure of my own creation. What I want to know is where I should be looking to implement this: is this done in my file where I defined my constraint problem?, or do I need to make changes elsewhere in the source code? From the examples I've seen, every single one has simply printed an optimal solution without doing anything more, while I want to store it for later purposes and solve another CP of the same structure with different data.
Thanks,Nathan

From: cschulte at kth.se
To: ngh423 at hotmail.com; users at gecode.org
Subject: RE: [gecode-users] Creating a function to solve CP sub-problem instances
Date: Mon, 15 Sep 2014 11:49:07 +0200

Hi, The setup is that a script must be a sub-class of Gecode::Space. However, you can pass these objects around, so I do not really see where the problem is, sorry.  CheersChristian --Christian Schulte, Professor of Computer Science, KTH, www.gecode.org/~schulte/ From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf Of Nathan Horvath
Sent: Tuesday, September 09, 2014 8:45 PM
To: users at gecode.org
Subject: [gecode-users] Creating a function to solve CP sub-problem instances Hi, I'm trying to implement a tabu search algorithm that involves solving small constraint programming sub-problems. Firstly, I used the examples found in the Modelling and Programming Guide to develop a script to solve an instance of a sub-problem. Now, I'm looking to expand upon this by creating a function that consumes data to solve a sub-problem, solve it using Gecode, and then return an optimal solution to the sub-problem in a some data structure. I'm having problems trying to turn my script into a callable function. Given from what I've seen in the guide, it seems like it is not possible, or it's taken as something trivial and is not glossed over, as I haven't found any similar examples after searching on-line. What I started to do was play around with the print function (same layout as in the SEND MOST MONEY examples in the guide) and try replacing it with a function that interprets the solution, but I've had no luck. One could classify my experience with Gecode and C++ as very beginner (I picked up C++ so I could use Gecode's capabilities), so I apologize if this question comes off as ignorant or out of scope. Any help would be greatly appreciated. Cheers,Nathan 		 	   		  
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