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System Identification Tool: unstable poles and zeroes?

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Christoph Thale
Christoph Thale 2020-2-1
Hi,
I am using the System Identification Tool for estimating a transfer function.
At the Estimation Options there is no check (and i am not able to check) at 'Allow unstable models'. But in my result of the discrete -time model i got poles and zeroes in the right and left half with a magnitude above 1. That indicates that the model is unstable. Now I am confused and asking for help.
Greets

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