[Octave-bug-tracker] [bug #40971] scatter fails in gnuplot when all points are the same color

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?40971>

                 Summary: scatter fails in gnuplot when all points are the
same color
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 19 Dec 2013 06:41:39 AM PST
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: Any

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Details:

Using the attached scatter_tst.m file, gnuplot fails in __gnuplot_drawnow__.

Steps to reproduce:


graphics_toolkit gnuplot
scatter_tst (0)
error: vertical dimensions mismatch (101x3 vs 1x1)
error: called from:
error:  
/home/rik/wip/Projects_Mine/octave-dev/scripts/plot/util/private/__go_draw_axes__.m
at line 1062, column 32
error:  
/home/rik/wip/Projects_Mine/octave-dev/scripts/plot/util/private/__go_draw_figure__.m
at line 172, column 17
error:  
/home/rik/wip/Projects_Mine/octave-dev/scripts/plot/util/__gnuplot_drawnow__.m
at line 86, column 5


The scatter_tst.m file is attached and shown below.


function scatter_tst (tiny = 0)
  clf;
  n=101;
  x = rand (n,1);
  y = rand (n,1);
  z = rand (n,1);
  s = 20*rand(n,1);
  c = abs (0.5 * (ones (n,3) - tiny*rand (n,3)));
  scatter (x, y, s, c, "s");
endfunction


Note that this only fails when n > 100 and __scatter__ is trying to compact
the number of colors it uses when it calls patch().  Also, it only happens
when there is a single unique color.  If the variable tiny is changed, say to
0.1, then the code also works.  Finally, this really is only gnuplot.  OpenGL
plotting using FLTK works just fine.  Given that this is the default going
forward this bug may be less critical.




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File Attachments:


-------------------------------------------------------
Date: Thu 19 Dec 2013 06:41:39 AM PST  Name: scatter_tst.m  Size: 213B   By:
rik5

<http://savannah.gnu.org/bugs/download.php?file_id=30045>

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