[Cbc] Two questions on Cbc Solver with AMPL

[Feng Gao]

Dear Sam:

   Thank you! It helps.

Feng

On Tue, Sep 26, 2017 at 2:42 AM, Sam Mathew <sam.cfd.iitm at gmail.com> wrote:

> Hi Feng,
>
> The answer to your 2nd question - you can set it using the ratio
> parameter, e.g.,
>
> cbc ratio 0.005 solve
>
> This will mean that the solver solves until the ratio (actually gap ratio)
> between the current MIP solution and the LP solution is 0.005. You can set
> it to an appropriate value.
>
> Best regards,
> Sam
>
> On 25 September 2017 at 17:40, Giacomo Nannicini <giacomo.n at gmail.com>
> wrote:
>
>> Feng,
>> I believe you need to compile with the ASL solver, otherwise CBC will not
>> have an AMPL interface. Look into ThirdParty/ASL.
>>
>> You can probably also get binaries directly from the AMPL website, in the
>> open-source solver section.
>>
>> Giacomo
>>
>> On Sep 24, 2017 10:38 PM, "Feng Gao" <mangotree.gf at gmail.com> wrote:
>>
>> Dear Cbc Users:
>>
>>       I have two questions regarding to Cbc Solver with AMPL. Please help.
>>
>> 1. I use AMPL + Cbc solve to run a case, however, AMPL issued an error
>> message "Unable to open a file" where a solution is located. I compiled the
>> Cbc solver using VS and the solver is working fine in a stand-alone mode.
>>
>> ------------------------------------------------------------
>> ------------------------------------------------------------
>> ---------------------------------
>> ampl: solve
>> ampl? ;
>> Welcome to the CBC MILP Solver
>> Version: 2.9.9
>> Build Date: Sep 19 2017
>>
>> command line - C:\COIN\Cbc\Cbc\MSVisualStudio\v10\x64-v100-Release\cbc.exe
>> C:\Users\Feng\AppData\Local\Temp\at2596 -AMPL (default strategy 1)
>> Unable to open file C:\Users\Feng\AppData\Local\Temp\at2596
>> No match for AMPL - ? for list of commands
>> Total time (CPU seconds):       0.00   (Wallclock seconds):       0.00
>>
>> Error executing "solve" command:
>> can't open C:\Users\Feng\AppData\Local\Temp\at2596.sol
>> ------------------------------------------------------------
>> ------------------------------------------------------------
>> ---------------------------------
>>
>> 2. How to set a "MIP GAP" termination criteria in Cbc solver command
>> line. The manuals only provide a time limit or the maximal number of
>> iterations termination criteria though.
>>
>> Thank you very much,
>>
>> Feng
>>
>>
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>
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