Matlab: Vertical black line in bode diagram

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Amlaith
Amlaith le 25 Juin 2011
Commenté : Siddharth Jawahar le 23 Oct 2020
What does the vertical black line in the bode diagram with multiple functions stand for? for example: >>figure, bode(c1,d1,d2,d3,d4,d5)
Both in the phase and magnitude diagrams.

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Paulo Silva
Paulo Silva le 25 Juin 2011
That seems to appear only for discrete systems (c2d with Ts for sampling), I can't find documentation about it but it appears related to the nyquist rate and the frequency value of the black line seems to be pi*1/Ts
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Siddharth Jawahar
Siddharth Jawahar le 23 Oct 2020
Hi Amlaith,
Paulo is right, this represents the nyquist frequency of the system. Documentation is here in the last line of this section:
https://www.mathworks.com/help/control/ref/bode.html?s_tid=srchtitle#bvkcuu1
Sid

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