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