[Octave-bug-tracker] [bug #53210] contourf does not fill a single level when colormap is gray

[Marco Caliari]

URL:
  <http://savannah.gnu.org/bugs/?53210>

                 Summary: contourf does not fill a single level when colormap
is gray
                 Project: GNU Octave
            Submitted by: caliari
            Submitted on: Fri 23 Feb 2018 10:02:31 AM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: GNU/Linux

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Details:

The following script


x = linspace(-2,2);
[X,Y] = meshgrid(x);
contourf(X,Y,X.^2+Y.^2-1,[0,0])


displays a white ball in a coloured background for any colormap I tried but
colormap(gray), for which the background is white. For sure it was gray (as it
should, in matlab too) in some previous versions of octave.





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