bugGNU Octave - Bugs: bug #49437, Wrong tick labels (e.g. 1.10e-4)...

 
 

bug #49437: Wrong tick labels (e.g. 1.10e-4) on logarithmic axis (MS Windows)

Submitted by:  Martin Kunz <mkunz>
Submitted on:  Tue 25 Oct 2016 09:23:55 AM UTC  
 
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Fixed Assigned to:  None
Originator Name:  mkunz Open/Closed:  Closed
Release:  4.2.0-rc2 Operating System:  Microsoft Windows

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Wed 26 Oct 2016 06:46:41 AM UTC, comment #4: 

That was fast. Thanks Rik!

Martin Kunz <mkunz>
Wed 26 Oct 2016 04:54:48 AM UTC, comment #3: 

I fixed this on the stable branch here (http://hg.savannah.gnu.org/hgweb/octave/rev/a17848537a67).  I'm not sure whether this will make it in to 4.2.0 or the bug fix release 4.2.1.

There were multiple issues, but the problme for Windows machines was the roundoff error in std::pow that has been seen before.

Rik <rik5>
Project Administrator
Tue 25 Oct 2016 10:56:53 PM UTC, comment #2: 

This seems to be round-off error that we have encountered before on MS Windows platform with respect to exponents and the std::pow function.  I think I have a fix, but it will take me a few hours to build with MXE and test.

Rik <rik5>
Project Administrator
Tue 25 Oct 2016 09:45:39 PM UTC, comment #1: 

WTF Microsoft?  I can reproduce this on a Windows XP virtual machine, but a Linux PC works just fine.  It has something to do with using the mouse as well, because I can manually zoom the plot with

zoom (0.5)

And the labels are then fine.

It seems to be a problem whenever you get to 10^-4 power.  Smaller powers are okay.  Very strange.

Rik <rik5>
Project Administrator
Tue 25 Oct 2016 09:23:55 AM UTC, original submission:  

The following lines

graphics_toolkit qt
loglog(1./((1:10).^8))

produce initially a nice looking plot. After zooming out once by turning the mouse wheel strange labels appear on the y ticks:

>> get(gca,"yticklabel")
ans =
{
  [1,1] = 1.10^{-15}
  [1,2] = 1.10^{-14}
  [1,3] = 1.10^{-13}
  [1,4] = 1.10^{-12}
  [1,5] = 1.10^{-11}
  [1,6] = 1.10^{-10}
  [1,7] = 1.10^{-9}
  [1,8] = 1.10^{-8}
  [1,9] = 1.10^{-7}
  [1,10] = 1.10^{-6}
  [1,11] = 1.10^{-5}
  [1,12] = 1.10^{-4}
  [1,13] = 10^{-3}
  [1,14] = 10^{-2}
  [1,15] = 10^{-1}
  [1,16] = 10^{0}
}

Switching a "screwed" figure to the FLTK toolkit preserves the faulty labels whereas they do not show up in figures that were set to FLTK before the loglog command.

Martin Kunz <mkunz>

 

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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2016-10-26 rik5 StatusIn Progress => Fixed
        Open/ClosedOpen => Closed
    2016-10-25 rik5 Carbon-Copy- => Added pantxo
    2016-10-25 rik5 Dependencies- => Depends on bugs #46055
    2016-10-25 rik5 StatusConfirmed => In Progress
    2016-10-25 rik5 StatusNone => Confirmed
        SummaryWrong tick labels (e.g. 1.10e-4) on logarithmic axis => Wrong tick labels (e.g. 1.10e-4) on logarithmic axis (MS Windows)

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