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[Octave-bug-tracker] [bug #53164] Incorrect Nyquist plot

From: anonymous
Subject: [Octave-bug-tracker] [bug #53164] Incorrect Nyquist plot
Date: Thu, 15 Feb 2018 13:03:47 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36

Follow-up Comment #7, bug #53164 (project octave):

The tails can be useful - I'm working on describing function (control systems
theory) where it's important whether the plot of the decribing function of the
nonlinear part and the nyquist plot of the linear part intersect.
In this case (three-position regulator without hysteresis) - they can but in
the part which isn't visible.

Reading the help I found the solution - giving the frequency range I was able
to get desired plot.

I asked my collegue to draw this plot in MatLab and these parts of the plot
were visible by default.
Generally speaking - that's not a bug but it can be misleading.
In this case it was easy to find out that something's wrong because the
equation was simple. However, for something more complicated not seeing a part
of the plot can be a problem.


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