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[Octave-bug-tracker] [bug #46617] Wrong labeling of Yticks


From: anonymous
Subject: [Octave-bug-tracker] [bug #46617] Wrong labeling of Yticks
Date: Sun, 06 Dec 2015 16:28:52 +0000
User-agent: Opera/9.80 (X11; Linux x86_64; Edition Linux Mint) Presto/2.12.388 Version/12.16

URL:
  <http://savannah.gnu.org/bugs/?46617>

                 Summary: Wrong labeling of Yticks
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 06 Dec 2015 04:28:51 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Edwin de Koning
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: Any

    _______________________________________________________

Details:

I have a program where the data is plotted and an algorithm determines the
settings of the Y-axis. I also want to know what the Y-axis labels are. But I
noticed that the "get(gca, 'YTick')" command responds a wrong answer.

Like this:


plot(1:10)
get(gca, 'YTick') % this one is correct
% ans =
%    0    2    4    6    8   10

v=axis; v(4)=11; axis(v)
get(gca, 'YTick') % this one is wrong
% ans =
%    0    2    4    6    8   10   12
%    Wrong: the number 12 is not displayed on the Y-axis.


Another fault is only generated with gnuplot:


graphics_toolkit("gnuplot")
plot(1:201, 6*ones(1,201));
hold on
get(gca, 'YTick')
% ans =
%   5.4000   5.6000   5.8000   6.0000   6.2000   6.4000   6.6000
%   Ok, this is good.

v = axis; v(3) = 0; v(4) = ceil(v(4)) + 1; axis(v)
grid on
get(gca, 'YTick')
% ans =
%   0   2   4   6   8
%   Wrong: the Y-axis shows: 0   1   2   3   4   5   6   7   8










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