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how to constrain tfest to give minimum phase zeros

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Alan
Alan on 16 Feb 2016
Edited: Alan on 16 Feb 2016
I am trying to apply the MATLAB ident toolbox function "tfest" to some data. It is returning a non-minimum phase zero, yet I get a better visual fit to the phase of the data if I force the zero to be minimum phase.
Why does "tfest" do this and how do I force the zeros to be minimum phase?

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Alan
Alan on 16 Feb 2016
Edited: Alan on 16 Feb 2016
init_sys = idtf([NaN NaN NaN],[1 NaN NaN NaN]);
init_sys.Structure.num.Minimum = 0;
init_sys.Structure.den.Minimum = 0;
T=tfest(z,init_sys);
is the solution.

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