[Couenne] Couenne_Optimal_point

[Pietro Belotti]

Dear Ehsan,

> 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?

Yes. After Couenne has terminated, problem.sol will have an optimal solution.

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 07/06/2010, ehsan ullah <ehsanmath at yahoo.com> wrote:

> 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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