Pole Zero Map using two vectors

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Felix
Felix 2018-11-19
回答： Star Strider 2018-11-19
Hey everyone, I have a question concerning the use of the pzmap-function of Matlab which uses a dynamic system model as function input. My problem is how to build such a dynamic system out of a bode plot where I have the following n-dimensional vectors given:
bode_vec = [x1 + j*y1, x2 + j*y2, ..., xn + j*yn ]
freq = [f1, f2, ..., fn]
When I plot the Bode diagram I just use the line
bodeplot = semilogx(ax,freq,20*log10(abs(bode_vec)));
and everything works fine. But how do I get a dynamical system in order to plot a pzmap of the system?
Thanks in advance!
Felix

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Star Strider
Star Strider 2018-11-19
This is a system identification problem. Use the System Identification Toolbox. Start with the iddata (link) function, then tfest (link) since you are starting with a Bode plot.

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