how to make a nyquist plot by using frequency response vector ?

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Xiaochen
Xiaochen le 17 Déc 2013
system is SISO, the frequency response vector in some frequency point is known (include abs,re,im). but the exactly FRF or TF is not known. in this condition, how to plot a nyquist curve? the matlab function 'nyquist' can plot nyquist only if there is a exactly TF. straightly plot the im & re, then
it is not smooth like a circle..

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