[Octave-bug-tracker] [bug #55908] Closing 2D plots much slower in Octave 5.1.0

[anonyme]

URL:
  <https://savannah.gnu.org/bugs/?55908>

                 Summary: Closing 2D plots much slower in Octave 5.1.0
                 Project: GNU Octave
            Submitted by: None
            Submitted on: mer. 13 mars 2019 09:22:10 UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Any

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Details:

For 2D plots, closing a figure takes a very long time in Octave 5.1.0, while
it only takes a fraction of second in Octave 4.4.1.

Here is a test, to reproduce the issue:

1. Plot a (rather complex) 2D figure with contours and labels:

x = [-1 : 0.05 : 10];
y = [-1 : 0.05 : 10];
z = sin(x') * cos(y);

figure(1);
[c, h] = contour(x, y, z, [-1 : 0.03 : 1]);
clabel(c, h, 'FontSize', 15, 'Color', 'k');

2. Close the figure:
tic; close(1); toc

Here are the timings for close():

Octave 4.4.1
------------

Windows 7 64 bits => 0.1 s
Ubuntu Linux 18.04 64 bits => 0.2 s

Octave 5.1.0
------------

Windows 7 64 bits => 14 s
Ubuntu Linux 18.04 64 bits => 12 s

As you see, closing the figure is nearly 100 times slower in Octave 5.1.0.

I also noticed that plotting the figure is ~20% slower in Octave 5.1.0.

Closing a simple 1D plot, doesn't have the issue, as far I can tell... 


 





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