[Minotaur] User defined objective function

[Nikolaos Kazazakis]

Dear Cristiano,

You can define the objective function through an AMPL .mod file, e.g.:

# Start of mod file
var x {1..2};

minimize obj:
     cos(x[1]+x[2]+2)+log(x[1]);

     subject to cons0:
     -4<=x[1]<=4;
     subject to cons1:
     -1<=x[2]<=3;
# End of mod file

Minotaur normally reads the .mod filename through the input, i.e.:

$ ./minotaur_exe problem_file

and then (inside the code):

   problem = 
iface.readInstance(options->findString("problem_file")->getValue());

You can read another file (let's say "second_file") by:

   problem = iface.readInstance("second_file");

You can have multiple problem instances in your code this way, i.e. you 
can set minotaur to read more than one file and get multiple functions 
in your code, although when I tried to have to ProblemPtr type problems 
on my setup I was getting segfaults when assigning memory (with 
setNativeDer).

If you create the second problem as a RelaxationPtr though you can have 
as many problem instances as you want, it works fine!

Kind regards,
Nikos


On 10/11/14 13:15, Cristiano Arbex Valle wrote:
> Hi Ashutosh / Minotaur team
>
> Is it possible to have in Minotaur an independently user-defined 
> objective function, which Minotaur would call whenever it needs to 
> compute the objective function?
>
> Thank you and best regards,
>
> --
> Cristiano Arbex Valle
>
>
>
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> Minotaur at lists.mcs.anl.gov
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