[Couenne] Couenne_Optimal_point

[ehsan ullah]

Dear Prof. Pietro Belotti
First of all thanks for your reply.
I am not  much used to with AMPL.  Currently what  i am doing is the  following.
I prepare a problem.nl  file using AMPL.
Then  I run couenne independently at command line (./couenne  ./problem.nl)
Then I get the file  problem.sol
Can I read the file problem.sol using AMPL  and get the values of variables now?
Or I need to call couenne using AMPL instead  of command line? 
Thanks in advance


Ehsan Ullah

PhD student

Lehrstuhl für Symbolic Computation

Passau Universität

Germany

Ph# 0049-851-2016296

Mobile: 0049-176-45196854

Email: ehsanmath at yahoo.com

--- On Mon, 5/7/10, Pietro Belotti <belotti at Lehigh.EDU> wrote:

From: Pietro Belotti <belotti at Lehigh.EDU>
Subject: Re: [Couenne] Couenne_Optimal_point
To: "ehsan ullah" <ehsanmath at yahoo.com>
Cc: couenne at list.coin-or.org
Date: Monday, 5 July, 2010, 5:28 PM

Dear Ehsan,

> If I have a MINLP, and  i want to  find the optimal value as well as the point(optimal point) at  which the objective function achieves optimal value then  is there any way to do it in Couenne.

Couenne, for now, accepts instances through AMPL. After solving the problem stored in the file /my/directory/problem.nl, The AMPL interface stores a text file /my/directory/problem.sol with an optimal solution. This format is readable from AMPL, and I don't know if other programs can read it. However, if you know the number of variables n, it seems that the last n lines of that .sol file contain the optimal solution. As I said, I don't know if this works all the time and if this is the official way to read a .sol file.

Hope this helps.

Regards,
Pietro



_________________________________________
Pietro Belotti, Lehigh University
Dept. of Industrial and Systems Engineering
200 W Packer Ave, Bethlehem PA 18015.
phone: 610-758-3865   fax: 610-758-4886
email: belotti at lehigh.edu
web:   http://www.lehigh.edu/~pib208


On 07/05/2010, ehsan ullah <ehsanmath at yahoo.com> wrote:

> Dear Couenne Team
> I have  just  started using  Couenne. I am writing you  to as just a short question.
> If I have a MINLP, and  i want to  find the optimal value as well as the point(optimal point) at  which the objective function achieves optimal value then  is there any way to do it in Couenne.
> I am running Couenne with command line and i get only the value of objective function.
> I shall be thankful for reply
> thanks in  advance
> Ehsan Ullah
> PhD  student
> Lehrstuhl für Symbolic Computation
> Passau Universität
> Germany
> Ph# 0049-851-2016296
> Mobile: 0049-176-45196854
> Email: ehsanmath at yahoo.com
> 
> 
> 



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