How to designate a variable in syms function

My code is the following:

What I'd like to happen is that the symbolic variable would be whatever I put in poly{1}. However, the eval() function for poly{2} only works when I declare syms x. If I changed the main variable in the second field, it does not work anymore. How can I fix this?

Answer 1

[Hulk Hogan]

The goal is to create symbolic variables via inputdlg. Here is what I did:

I used the sym() function inside syms. That's how I solved the problem.