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Extract values from Nyquist for negative frequencies

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Leo
Leo 2021-2-27
回答： Paul 2021-2-27
Hi,
is there a way of extracting values (Real part & Imaginary part) from the nyquist plot for the negative frequencies? At the moment I am using the following code:
[re,im,w_h] = nyquist(h);
Re = squeeze(re);
Im = squeeze(im);
This code only gives me the Real- and Imaginary part values for positive frequencies. "w_h" is always postivie even though nyquist also has negative frequencies.
Thanks very much for your help!

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Paul
Paul 2021-2-27
The Nyquist plot is symmetric, so the compex cojugate of the output would correspond to the negative frequencies.
[re_pos,im_pos,w_h] = nyquist(h);
re_neg = re_pos;
im_neg = -im_pos;

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