How to designate a variable in syms function

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Hulk Hogan
Hulk Hogan 2020-6-21
回答： Hulk Hogan 2020-6-21
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?

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Hulk Hogan
Hulk Hogan 2020-6-21
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.

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