bugGNU Octave - Bugs: bug #45851, Dot plot inaccurate

 
 

bug #45851: Dot plot inaccurate

Submitter:  None
Submitted:  Mon 31 Aug 2015 08:11:05 PM UTC
   
 
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Inaccurate Result
Status:  Duplicate Assigned to:  None
Originator Name:  Pablo Creades Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 3.8.2
Operating System:  * GNU/Linux Fixed Release:  None
Planned Release:  None
* Mandatory Fields

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Mon 31 Aug 2015 08:19:58 PM UTC, comment #1: 

Thanks for investigating and reporting a simple test case. This is yet another example of a known problem with the OpenGL-based plotting that Octave implements.

You've identified the possible workarounds for now, use gnuplot or scale the data so it has fewer significant digits.

 Mike Miller <mtmiller>
Group Member
Mon 31 Aug 2015 08:11:05 PM UTC, original submission:  

I've noticed that when the X data is floating point with lots of decimals, the line and dotted line plots generated using "fltk" are misaligned, and even worst, the lines and dots moves randomly as you resize the plot window.
This behavior is not exhibited when using "gnuplot".
Here is a simple piece of code that would reproduce the error:

plot([7777777.0, 7777777.1], [1,2], ".-")

I found the problem when trying to plot time series in which the x axis contain the date as the number of days since January 1st 0000, as returned by the function "datenum".

 Anonymous

 

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Depends on the following items
bugsOpenGL plotting backend uses single precision, not double (bug #32980, Confirmed)

Digest:
   bug dependencies.

Items that depend on this one: None found

 

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  • -email is unavailable- added by mtmiller (Posted a comment)

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-08-31 mtmiller StatusNone Duplicate
        Open/ClosedOpen Closed
        Dependencies- Depends on bugs #32980

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