The initialization of my model fails with the following error message:
EXIT: Invalid number in NLP function or derivative detected.
I am not so familiar with JModelica. How can I find out why initialization fails or how can I get more debug information? In my opinion the model is initialised correctly.
Hi,
The error message means that Ipopt detected an error in function evaluations, typically a divide by zero or a logarithm of a negative number. If you model contains such elements, I suggest you introduce max/min limits to prevent evaulation of the model equations in regions where the DAE residual is not defined.
Best
/Johan