[Ipopt] AMPL options problem

[Juan Ignacio Laiglecia]

Andreas 
Thank you very much for your reply.
Its works now!!
Thanks again, Juan

 
> Date: Thu, 12 May 2011 11:09:40 -0400
> From: andreasw at watson.ibm.com
> To: juanlaiglecia at hotmail.com
> CC: ipopt at list.coin-or.org
> Subject: Re: [Ipopt] AMPL options problem
> 
> Hi Juan,
> 
> Not all Ipopt options can be set from the AMPL command line. You can see 
> the list of options available through AMPL by typing
> 
> ipopt -=
> 
> in a shell, where "ipopt" is your AMPL Ipopt solver executable.
> 
> I added this particular option to the list of recognized options in AMPL, 
> and committed it to Ipopt/trunk. It will be available in the next release 
> (or now in trunk, if you use the develpment version via svn).
> 
> But you can always set all Ipopt option using the ipopt.opt file. So, 
> even with your current Ipopt version, you can just create a file called 
> 'ipopt.opt' in the directory where you run AMPL, and include the line
> 
> ma57_pivot_order 4
> 
> See also the Ipopt documentation about the use of the ipopt.opt options 
> file.
> 
> Hope this helps,
> 
> Andreas
> 
> On Thu, 12 May 2011, Juan Ignacio Laiglecia wrote:
> 
> >
> > Dear,
> > I have had problem when I used this IPOPT option:
> > ma57_pivot_order
> >
> > I am solving an entire natural gas plant in AMPL and I am very interested in reducing the computational times. In the ipopt option line I introduced it in this way:
> >
> > option ipopt_options " linear_solver ma57 ma57_pivot_order 4 ";
> > option solver ipopt ;
> >
> > When I run the problem, AMPL send me: Unknown Keyword “ma57_pivot_order”
> > Do you know what would the problem be? I should mention that I have the ipopt3.8 version.
> >
> > Thank you very much in advance.
> > Juan
> >
 		 	   		  
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