[Octave-bug-tracker] [bug #63234] Plot line doesn't match markers with large X values

[David Gesswein]

URL:
  <https://savannah.gnu.org/bugs/?63234>

                 Summary: Plot line doesn't match markers with large X values
                 Project: GNU Octave
               Submitter: djg
               Submitted: Tue 18 Oct 2022 04:54:01 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: David Gesswein
        Originator Email: 
             Open/Closed: Open
                 Release: 7.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux


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Follow-up Comments:


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Date: Tue 18 Oct 2022 04:54:01 PM UTC By: David Gesswein <djg>
load('data');

plot(data(1:500,1),data(1:500,2),'-+')

The + markers show the real data. The line drawn is very coarse and doesn't
match the markers. See course-plot.png. Line is the same when only line
drawn.


If you make X values smaller graph is less coarse but if you zoom in the
markers are still not on the line.
plot(data(1:500,1)-7e5,data(1:500,2),'-+')

zooming in with the full data set and markers is also around 20 seconds.

Initially seen with Octave 6.4.0 on Fedora Core 35. Installed the 7.2.0
Anaconda version to test and got same behavior.

Large X values are datenum values. Same behavior seen when X is set to
datetick('mm/dd/yy')







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File Attachments:


-------------------------------------------------------
Date: Tue 18 Oct 2022 04:54:01 PM UTC  Name: data  Size: 169KiB   By: djg

<http://savannah.gnu.org/bugs/download.php?file_id=53876>
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Date: Tue 18 Oct 2022 04:54:01 PM UTC  Name: coarse-plot.png  Size: 15KiB  
By: djg

<http://savannah.gnu.org/bugs/download.php?file_id=53877>

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