From susana.lera at lsespace.com  Wed Jan 23 09:56:42 2008
From: susana.lera at lsespace.com (Susana Lera)
Date: Wed, 23 Jan 2008 15:56:42 +0100 (CET)
Subject: [GAMSlinks] IPOPT options  through GAMS
Message-ID: <31383767.261201100202637.JavaMail.root@mx1.lsespace.com>

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?

Thanks.
Susana

From stefan at math.hu-berlin.de  Wed Jan 23 10:12:36 2008
From: stefan at math.hu-berlin.de (Stefan Vigerske)
Date: Wed, 23 Jan 2008 16:12:36 +0100
Subject: [GAMSlinks] IPOPT options  through GAMS
In-Reply-To: <31383767.261201100202637.JavaMail.root@mx1.lsespace.com>
References: <31383767.261201100202637.JavaMail.root@mx1.lsespace.com>
Message-ID: <47975964.7070000@math.hu-berlin.de>

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, ...

Best,
Stefan

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

From stefan at math.hu-berlin.de  Wed Jan 23 10:25:24 2008
From: stefan at math.hu-berlin.de (Stefan Vigerske)
Date: Wed, 23 Jan 2008 16:25:24 +0100
Subject: [GAMSlinks] IPOPT options  through GAMS
In-Reply-To: <47975964.7070000@math.hu-berlin.de>
References: <31383767.261201100202637.JavaMail.root@mx1.lsespace.com>
	<47975964.7070000@math.hu-berlin.de>
Message-ID: <47975C64.6030104@math.hu-berlin.de>

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