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[Octave-bug-tracker] [bug #58015] axis equal 'clears' the plot

From: anonymous
Subject: [Octave-bug-tracker] [bug #58015] axis equal 'clears' the plot
Date: Sat, 21 Mar 2020 15:11:39 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0


                 Summary: axis equal 'clears' the plot
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 21 Mar 2020 07:11:37 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Aron Bergman
        Originator Email: address@hidden
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux



I'm doing a lab in numerical analysis where we are given a function that will
generate a plot with the fill command. The plot is supposed to look like a
circle, but when generating the polygons it looks like an ellipse due to the
axis scaling, so the last command is `axis equal`, but this seems to clear the
plot for me.

I looked into the problem myself and when debugging axis.m[1] I found that
works fine up until line 234[2], after that line the plot seems to be cleared.
I ran the program again and kept track of the value of "plotboxaspectratio"
and after it had been set on line 234 I reset it and the plot showed up

The original value of "plotboxaspectratio" was [1 1 1.25] and after playing
around with it for a while I came to the conclusion that the plot will be
cleared for values < 1.25. 

I don't understand the reason why the aspect ratio of the z-value would impact
this 2D plot, so I don't feel comfortable making a suggestion to a fix. 



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