Solved
A little symbolic problem
Hi, I met a little problem and hope for your help.
How to overcome this behavior without manual intervention?
MC15 File is attached
You have to differentiate (name differently) between the X as parameter of the function, and X as the vector you defined before.
Within the definition of the function u, the best(closest) known X is the parameter of that function u, that is X, which at that point is unknown to be a vector...
Success!
Luc