[Ipopt] solving cops-3 problems with ipopt

Dieter Kraft kraft at hm.edu
Sat Aug 15 18:39:23 EDT 2009

Hi all subscribers, hi Andreas,

I want to solve cops-3 problems with ipopt-3.7.0 using
I copied $COPS_HOME/solvers/minos/initial to
$COPS_HOME/solvers/ipopt/initial and modified it to

#!/usr/bin/perl -w

open OPTIONS, "> ipopt.opt";
print OPTIONS "option ipopt_options 'outlev 1 maxit 5000 max_cpu_time
close OPTIONS;

What I get is the following output in

Presolve eliminates 3 constraints.
Adjusted problem:
50 variables, all nonlinear
100 constraints; 247 nonzeros
	51 nonlinear constraints
	49 linear constraints
1 linear objective; 50 nonzeros.

Ipopt 3.7.0: outlev 1
maxit 5000
max_cpu_time 1800

Exception of type: OPTION_INVALID in file "IpOptionsList.cpp" at line 638:
 Exception message: Read Option: "option". It is not a valid option. Check
the list of available options.
ampl_ipopt.cpp: Error in second Initialize!!!!

COPS runtime: 0

which is not what I expect nor want

Thanks for any help

Dieter Kraft
Munich University of Applied Sciences
kraft at hm.edu

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