A little symbolic problem

[ifomenko]

Hi, I met a little problem and hope for your help.

How to overcome this behavior without manual intervention?

MC15 File is attached

[Fred_Kohlhepp]

Try vectorizing your expression:

[ifomenko]

no result(:

[LucMeekes · Accepted solution]

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

[ifomenko]

Thank you Luc

[Werner_E]

> How to overcome this behavior without manual intervention?

maybe that way: