How can I extract steady state information of a given system response?

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Dear Matlab users
I have collected some faulty data of a polymerization palnt. I need to extract only steady state information. In other words I want to remove the transient behaviour. Is there any funcyion which can do this for me?
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Reyhane Mokhtarname
Reyhane Mokhtarname on 13 Sep 2020
Dear Ameer Hamza
actually I want to use the data as training samples for fault detection algorithm. I have 12 process variables which are projrcted in to principle component and residual subspaces. Number of PCs in my case is 3. The steady state data are under the ellipsoid. I want to remove data points above the ellipsoid.

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