[Octave-bug-tracker] [bug #54895] problem with plots where axes values are large

[Fabio]

URL:
  <https://savannah.gnu.org/bugs/?54895>

                 Summary: problem with plots where axes values are large
                 Project: GNU Octave
            Submitted by: efferre79
            Submitted on: Thu 25 Oct 2018 01:08:46 PM 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: 4.4.1
        Operating System: Any

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Details:

I am using octave 4.4.1 under Linux, I am experiencing a problem in data
visualization when the values on x-axis are large as soon as I use the qt or
fltk graphic backends. I am attaching a data file and a script to show the
problem.

As you can see in the attached images, the results are totally different (the
one with gnuplot is the correct one). It's not a problem of the plot()
function, you can also plot the entire dataset (now I am only plotting last
501 points) and later zoom in the last part to see the same problem.

If you plot column 3 as plot(d(end-500:end,3)) there is no problem so it's
definitely related to the values in the first column (I guess too large)

I am attaching the octave script to obtain the plots, you have to unpack the
data.log.bz2 file before executing the .m file

Same problem also under Windows with version:
----------------------------------------------------
GNU Octave Version: 4.4.1 (hg id: 1f46d371968c)
GNU Octave License: GNU General Public License
Operating System: MINGW32_NT-6.2 Windows 6.2  x86_64
----------------------------------------------------



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File Attachments:


-------------------------------------------------------
Date: Thu 25 Oct 2018 01:08:46 PM UTC  Name: data.log.bz2  Size: 224KiB   By:
efferre79

<http://savannah.gnu.org/bugs/download.php?file_id=45288>
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Date: Thu 25 Oct 2018 01:08:46 PM UTC  Name: data.m  Size: 147B   By:
efferre79

<http://savannah.gnu.org/bugs/download.php?file_id=45289>
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Date: Thu 25 Oct 2018 01:08:46 PM UTC  Name: data_gnuplot.png  Size: 15KiB  
By: efferre79

<http://savannah.gnu.org/bugs/download.php?file_id=45290>
-------------------------------------------------------
Date: Thu 25 Oct 2018 01:08:46 PM UTC  Name: data_qt.png  Size: 13KiB   By:
efferre79

<http://savannah.gnu.org/bugs/download.php?file_id=45291>

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