[GAMSlinks] IPOPT options through GAMS

[Stefan Vigerske]

Hi,

>> I am trying to run a nonlinear problem with IPOPT through GAMS.
>> I made a ipopt.opt file where I write my ipopt options. I tried to save this file in several locations, but it is never recognize by GAMS.
>>
>> Does anybody know where the right location for the file is? and whether this is the right file name and extension for defining the options?
> 
> The right place is the directory from which you start GAMS.
> To make GAMS/Ipopt recognize this file, you need to either give the 
> option optfile=1 at the gams command line (gams <model> optfile=1) or 
> put a <modelname>.optfile=1 statement in your gams model file.
> Otherwise, GAMS/Ipopt does not read an option file.
> 
> Btw, you can use alternative option files ipopt.op2, ipopt.op3, ..., 
> ipopt.o12, ... by setting optfile=2, optfile=3, ..., optfile=12, ...

What just come in my mind... Do you use the Ipopt that is delivered with 
GAMS or a selfcompiled version? In that case the name of the first 
option file is coinipopt.opt, not ipopt.opt.

Best,
Stefan

-- 
Stefan Vigerske
Humboldt University Berlin, Numerical Mathematics
http://www.math.hu-berlin.de/~stefan