[Octave-bug-tracker] [bug #43686] quiver doesn't handle case where 2 zero matricies are passed in as the vector fields

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?43686>

                 Summary: quiver doesn't handle case where 2 zero matricies
are passed in as the vector fields
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Mon 24 Nov 2014 08:23:57 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.1
        Operating System: GNU/Linux

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Details:

if you try plotting say quiver(zeros(5),zeros(5)) it gives the error

error: 'uu' undefined near line 196 column 16
error: called from:
error:   /usr/share/octave/3.8.1/m/plot/draw/private/__quiver__.m at line 196,
column 10
error:   /usr/share/octave/3.8.1/m/plot/draw/quiver.m at line 80, column 10

which is uninformative and makes it difficult when swapping pde solvers that
plot a vector field from matlab to octave, this led to a few hours of
annoyance as I had to figure out what uu was and why it was undefined. Please
fix small error but common when solving pde's or ode's.





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