[Cbc] Two questions on Cbc Solver with AMPL

[Feng Gao]

Dear Giacomo:

   Thank you! Can you please let me know where to locate ASL code  or
binary image? I searched AMPL website---- opensource section, but could not
find them...

http://ampl.com/products/solvers/open-source/

Thanks,

Feng

On Mon, Sep 25, 2017 at 8:10 PM, 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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