bugGNU Octave - Bugs: bug #47788, plotting jagged line with large...

 
 

bug #47788: plotting jagged line with large numbers; datetick generates large tic marks

Submitter:  Guan <xyzhaoguan>
Submitted:  Tue 26 Apr 2016 06:39:37 PM UTC
   
 
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Inaccurate Result
Status:  Duplicate Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * 4.0.2 Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Tue 26 Apr 2016 06:53:19 PM UTC, comment #1: 

Thanks for the thorough bug report. Yes, this is a known limitation of the OpenGL plotting capabilities of Octave at this point. See bug #32980 (and its other duplicates) for more background.

 Mike Miller <mtmiller>
Group Member
Tue 26 Apr 2016 06:39:37 PM UTC, original submission:  

I guess there is a roundup error in OpenGL plotting engine.

The following code generates ugly plots.

xt = 700000:0.1:700001
yt = 8000000:0.1:8000001
plot(xt,yt,'.-'); %% jagged line, tics are not equally spaced


xt = 700000:0.1:700001
yt=2:0.1:3
plot(xt,yt,'.-')   %% jagged line
datetick('x',15)  %% datetick generates long tick marks

This happens for both QT and fltk in windows 7.



Guan <xyzhaoguan>

 

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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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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2016-04-26 mtmiller StatusNone Duplicate
        Open/ClosedOpen Closed
        Operating SystemMicrosoft Windows Any
        Dependencies- Depends on bugs #32980

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