MATLAB Matlab Nyquist Problem


I was curious if anyone else had run into this issue.

It seems that if you try to do a nyquist diagram when there is an s-term by itself in the denominator (a pole at zero), Matlab mistakenly tries to use that value (instead of detouring around it), and produces an incorrect plot.

For example,

G(s) = -----------------
..........(s)(s + 3)(s + 5)

Will produce the wrong nyquist plot."

The same website provides a new function called" which was supposed to fix the problem, but the code has an error (it's kind of outdated), and the code is a little over my head in terms of troubleshooting.

I know it's a long shot, but I was hoping someone else had run into this and was able to provide a solution.
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