[Ipopt] Error system of Ipopt when using GAMS

[Stefan Vigerske]

Hi,

can you send the model so one can try to reproduce?
You seem to use model type DNLP? What non-differentiable functions are
you using?
You mal also wanna try GAMS 23.4.

Stefan

Am 27.05.2010 11:50, schrieb yanndan bronx:
> Hello Everyone,
> I have a weird problem with IPOPT using GAMS Interface. My problem is an non linear problem. I tried to resolve it on real instances but I got errors of the system. So I reduced my instances to a problem of small size which can be solved with a pen and a paper.However  I still have an error system.  I reproduce at the end of  this message the  solution report :
> I try to solve it with COUENNE and I get my solution. I tried with BONMIN ( I cheated,  I toldBONMIN that my problem was MINLP) BONMIN called Ipopt and we get the same error sytem.
> I am a bit stubborn, so I would like to see if the problem was coming from GAMS. I used CONVERT to transpose my instance into AMPL format. I tried and IPOPT achieve maximum of iterations. BONMIN and COUENNE find quickly the solution of my problem.
> Have you got any ideas to solve this kind of problem.
> Best Regards, Dan
> 
> 
> 
> ********************************************************************************************************************************************************************************************************************MODEL STATISTICS
> BLOCKS OF EQUATIONS           3     SINGLE EQUATIONS           12BLOCKS OF VARIABLES           5     SINGLE VARIABLES           41  6 projectedNON ZERO ELEMENTS            78     NON LINEAR N-Z             69DERIVATIVE POOL              16     CONSTANT POOL              19CODE LENGTH                 377
> 
> GENERATION TIME      =        0.125 SECONDS      4 Mb  WIN233-233 Dec 15, 2009
> 
> EXECUTION TIME       =        0.219 SECONDS      4 Mb  WIN233-233 Dec 15, 2009GAMS Rev 233  WIN-VIS 23.3.3 x86/MS Windows             05/27/10 09:13:46 Page 7G e n e r a l   A l g e b r a i c   M o d e l i n g   S y s t e mSolution Report     SOLVE min_Master_1 Using DNLP From line 406
> 
>                S O L V E      S U M M A R Y
>      MODEL   min_Master_1        OBJECTIVE  f_obj     TYPE    DNLP                DIRECTION  MINIMIZE     SOLVER  COINIPOPT           FROM LINE  406
> **** SOLVER STATUS     13 System Failure           **** MODEL STATUS      13 Error No Solution        **** OBJECTIVE VALUE               NA
>  RESOURCE USAGE, LIMIT         NA          1000.000 ITERATION COUNT, LIMIT        NA    2000000000 EVALUATION ERRORS             NA             0
> GAMS/CoinIpopt NLP Solver (IPOPT Library 3.7)written by A. Waechter
> List of user-set options:
>                                     Name   Value                used                            max_cpu_time = 300                   yes
> ******************************************************************************This program contains Ipopt, a library for large-scale nonlinear optimization. Ipopt is released as open source code under the Common Public License (CPL).         For more information visit http://projects.coin-or.org/Ipopt******************************************************************************
> NOTE: You are using Ipopt by default with the MUMPS linear solver.      Other linear solvers might be more efficient (see Ipopt documentation).
> 
> Exception of type: IpoptException in file "Unknown File" at line -1: Exception message: Unknown Exception caught in Ipopt
> No solution returned********************************************************************************************************************************************************************************************************************
> 
> 
> 
>       
> 
> 
> 
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