Thank you for answering. Sorry, I can't send you the model, it is a confidential one.
The compiler failed to get the incidence matrix and I obtained an error message like this one : incidence_row failed -DAELow.statesInEqns failed -DAELow.statesInEqns failed -DAELow.statesInEqns failed ... ... ... I verified all the if-equations, when equations and all known omc bugs via the Bug tracker.. The omc listed all the equations and variables and failed to get the incidence matrix, this mean probably that an equation or a variable is missing... But I am sure that there is no problem of singularity. Any idea or suggestion is more than welcome. Thank you in advance. Best Regards, Hassen --- En date de : Mer 18.8.10, Jens.Frenkel <[email protected]> a écrit : De: Jens.Frenkel <[email protected]> Objet: Re: Sorting equations À: [email protected] Date: Mercredi 18 août 2010, 19h49 Hi Hassen, there is may be a bug in the compiler and Pantelides algorithm would fail because of wrong input data. The first step to check this is to compile the model with the flags "+d=dumpdaelow,bltdump". Now you get the flat model and the incidence matrix. Maybe you see some curious equations. Good candidates are if equations or the equations the compiler print after the error message "no states found in equations:". You could also send the model via email, if it is possible for you. -- Mit freundlichen Grüßen, Kind regards, Jens Frenkel _________________________________________________________________ Dipl.-Ing. Jens Frenkel ***************************************************************** Technische Universität Dresden Institut für Verarbeitungsmaschinen und Mobile Arbeitsmaschinen D-01062 Dresden Tel: 0351 463-39278 Fax: 0351 463-37731 eMail: [email protected] ***************************************************************** ***************************************************************** Dresden University of Technology Institute of Processing Machines and Mobile Machinery D-01062 Dresden Germany Tel: +49 351 463-39278 Fax: +49 351 463-37731 eMail: [email protected] ***************************************************************** Am 18.08.2010 17:06, schrieb HADJ AMOR HASSEN: Hi, When compiling a big model within OpenModelica, I obtained the error message below : " Error: Model is structurally singular, error found sorting equations ............" The error message listed also a number of equations and their related variables. The model is not singular since it runs correctly under Dymola. Did this mean that the omc (DAELow module precisely) can't perform BLT sorting or index reduction for this model due to its complexity? As indication, the model have 1200 variables, 385 Unknowns and 53 continuous time states. The same model runs correctly on Dymola and it contains 3 numerical Jacobians. Thank you in advance. Regards, Hassen
