[Bonmin] Unconstrained MINLP

[Tony Kelman]

I think you’ll have to provide some simple example code of what you’re trying to do, and the error message in its entirety, for anyone to be able to tell exactly where the problem lies.


From: Ramesh, Ujwal (rameshul) 
Sent: Wednesday, October 29, 2014 11:39 AM
To: bonmin at list.coin-or.org 
Subject: [Bonmin] Unconstrained MINLP

Hi All,



I am trying to run Bonmin for my application which is an unconstrained MINLP. I am calling Bonmin through a C++ interface.  



To invoke Bonmin, I need to define a few virtual functions inm y code. 



As my application is an unconstrained MINLP, I will not be defining the constraint variables, constraint functions,function to compute jacobian and the function to compute the hessian of the Lagrangean ( eval_g, eval_jac_g,eval_h etc. ).




By not defining the above function I am initializing the respective vectors, matrices and the variables (number of non zeros in jacobian and hessian ) to NULL but this is causing the solver to fail with a length error.



I am a rookie to optimization and any inputs as to what I am missing is much appreciated. I guess I am missing something conceptually as I have double checked syntactical/logical correctness of code.  



Thanks a lot in advance.



Regards,

Ujwal Ramesh 
Graduate Student,
University Of Cincinnati
Ph: +1-513-302-4771


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