[Octave-bug-tracker] [bug #46325] Error with rlocus plot

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?46325>

                 Summary: Error with rlocus plot
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 29 Oct 2015 05:08:55 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Avirup Kundu
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: GNU/Linux

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Details:

I used the command  gh = tf([1],[1 6 12 8])  to generate the transfer function
and then  rlocus(gh)  to generate the root locus.

The root locus which is supposed to go off to infinity does not go off to
infinity and is terminated.This seems to be the problem with all plots going
off to infinity.

Upon clicking the autoscale button, the plot vanishes, only the dotted line
representing asymptotes remain.

If I use  gh1 = tf([1],[1 6]); rlocus(gh1)  and click autofocus, the entire
plot disappears only the legend remains.

Also the coloured dots used to mark the poles and zeros are not visible. Can
anything be done to solve that?






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