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[Octave-bug-tracker] [bug #53210] contourf does not fill a single level

From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #53210] contourf does not fill a single level when colormap is gray
Date: Fri, 23 Feb 2018 05:02:32 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0


                 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



The following script

x = linspace(-2,2);
[X,Y] = meshgrid(x);

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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