[Ipopt] Error Code Interpretation

[Majewski, Kurt]

Hi Mostafa,



in IpReturnCodes_inc.h you can find



enum ApplicationReturnStatus

  {

    Solve_Succeeded=0,

    Solved_To_Acceptable_Level=1,

    Infeasible_Problem_Detected=2,

    Search_Direction_Becomes_Too_Small=3,

    Diverging_Iterates=4,

    User_Requested_Stop=5,

    Feasible_Point_Found=6,



    Maximum_Iterations_Exceeded=-1,

    Restoration_Failed=-2,

    Error_In_Step_Computation=-3,

    Maximum_CpuTime_Exceeded=-4,

    Not_Enough_Degrees_Of_Freedom=-10,

    Invalid_Problem_Definition=-11,

    Invalid_Option=-12,

    Invalid_Number_Detected=-13,



    Unrecoverable_Exception=-100,

    NonIpopt_Exception_Thrown=-101,

    Insufficient_Memory=-102,

    Internal_Error=-199

  };



I would guess that in your case the original return code was casted to an unsigned 8 Bit number,

such that the number 255 you observe might belong to Maximum_Iterations_Exceeded=-1.



Regards,



Kurt Majewski



Siemens AG

Corporate Technology

Research and Technology Center

CT RTC BAM

Otto-Hahn-Ring 6

81739 München, Deutschland

Tel.: +49 89 636-633791

mailto:Kurt.Majewski at siemens.com



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Von: Ipopt [mailto:ipopt-bounces at coin-or.org] Im Auftrag von Mostafa.B
Gesendet: Thursday, February 01, 2018 12:37 PM
An: ipopt at list.coin-or.org
Betreff: [Ipopt] Error Code Interpretation



Hi All,



I am calling IPOPT to solve a problem formulated in Pyomo. However after quite a while of the solver running (and reallocating memory), it stops and returns solver error code 255. I was wondering what does this mean? and if there is any document where I could read what every error code means?



Regards,

Mostafa

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