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Bug in ListContourPlot?

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  Bug in ListContourPlot? Barak Shoshany <baraksh@gmail.com> - 2011-04-28 10:36 +0000
    Re: Bug in ListContourPlot? Ulf-Dietrich Braumann <braumann@uni-leipzig.de> - 2011-05-01 10:22 +0000
      Re: Bug in ListContourPlot? Barak Shoshany <baraksh@gmail.com> - 2011-05-02 10:52 +0000
    Re: Bug in ListContourPlot? Yves Klett <yves.klett@googlemail.com> - 2011-05-02 10:53 +0000
    Re: Bug in ListContourPlot? Peter Pein <petsie@dordos.net> - 2011-05-06 11:23 +0000

#1960 — Bug in ListContourPlot?

Please copy and paste this into a Mathematica notebook:

ListContourPlot[{{0.42256875000000005`, 3091.38125`,
   8.271213205043878`}, {0.42256875000000005`, 3092.00625`,
   6.266039117378199`}, {0.4263187500000001`, 3091.38125`,
   5.613752062730342`}, {0.4263187500000001`,
   3092.00625`, -5.684341886080802`*^-14}, {0.4263187500000001`,
   3092.63125`, 5.599651386371079`}, {0.43006875000000006`,
   3092.00625`, 6.059667975471868`}}]

When I execute this code on my computer (Mathematica v8.0.1, Windows 7
x64), the Mathematica kernel hangs. Does this happen to anyone else as
well?

Barak

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#2010

Hi, on my 8.0.1 installation (32bit WinXP), your small ListContourPlot
example is processed without any problems, no delay, no crash, etc.

Regards - Ulf-Dietrich


On Thu, 28 Apr 2011, Barak Shoshany wrote:

> Please copy and paste this into a Mathematica notebook:
>
> ListContourPlot[{{0.42256875000000005`, 3091.38125`,
>   8.271213205043878`}, {0.42256875000000005`, 3092.00625`,
>   6.266039117378199`}, {0.4263187500000001`, 3091.38125`,
>   5.613752062730342`}, {0.4263187500000001`,
>   3092.00625`, -5.684341886080802`*^-14}, {0.4263187500000001`,
>   3092.63125`, 5.599651386371079`}, {0.43006875000000006`,
>   3092.00625`, 6.059667975471868`}}]
>
> When I execute this code on my computer (Mathematica v8.0.1, Windows 7
> x64), the Mathematica kernel hangs. Does this happen to anyone else as
> well?
>
> Barak
>
>

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#2033

On May 1, 1:22 pm, Ulf-Dietrich Braumann <braum...@uni-leipzig.de>
wrote:
> Hi, on my 8.0.1 installation (32bit WinXP), your small ListContourPlot
> example is processed without any problems, no delay, no crash, etc.
>
> Regards - Ulf-Dietrich
>
>
>
>
>
>
>
> On Thu, 28 Apr 2011, Barak Shoshany wrote:
> > Please copy and paste this into a Mathematica notebook:
>
> > ListContourPlot[{{0.42256875000000005`, 3091.38125`,
> >   8.271213205043878`}, {0.42256875000000005`, 3092.00625`,
> >   6.266039117378199`}, {0.4263187500000001`, 3091.38125`,
> >   5.613752062730342`}, {0.4263187500000001`,
> >   3092.00625`, -5.684341886080802`*^-14}, {0.4263187500000001`,
> >   3092.63125`, 5.599651386371079`}, {0.43006875000000006`,
> >   3092.00625`, 6.059667975471868`}}]
>
> > When I execute this code on my computer (Mathematica v8.0.1, Windows 7
> > x64), the Mathematica kernel hangs. Does this happen to anyone else as
> > well?
>
> > Barak

Perhaps the problem only occurs on 64-bit systems.

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#2036

Hi,

I can confirm the crash with the pasted code on Win7 64 bit.

Regards,
Yves

Am 28.04.2011 12:36, schrieb Barak Shoshany:
> Please copy and paste this into a Mathematica notebook:
> 
> ListContourPlot[{{0.42256875000000005`, 3091.38125`,
>    8.271213205043878`}, {0.42256875000000005`, 3092.00625`,
>    6.266039117378199`}, {0.4263187500000001`, 3091.38125`,
>    5.613752062730342`}, {0.4263187500000001`,
>    3092.00625`, -5.684341886080802`*^-14}, {0.4263187500000001`,
>    3092.63125`, 5.599651386371079`}, {0.43006875000000006`,
>    3092.00625`, 6.059667975471868`}}]
> 
> When I execute this code on my computer (Mathematica v8.0.1, Windows 7
> x64), the Mathematica kernel hangs. Does this happen to anyone else as
> well?
> 
> Barak
> 

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#2136

Am 28.04.2011 12:36, schrieb Barak Shoshany:
> Please copy and paste this into a Mathematica notebook:
>
> ListContourPlot[{{0.42256875000000005`, 3091.38125`,
>     8.271213205043878`}, {0.42256875000000005`, 3092.00625`,
>     6.266039117378199`}, {0.4263187500000001`, 3091.38125`,
>     5.613752062730342`}, {0.4263187500000001`,
>     3092.00625`, -5.684341886080802`*^-14}, {0.4263187500000001`,
>     3092.63125`, 5.599651386371079`}, {0.43006875000000006`,
>     3092.00625`, 6.059667975471868`}}]
>
> When I execute this code on my computer (Mathematica v8.0.1, Windows 7
> x64), the Mathematica kernel hangs. Does this happen to anyone else as
> well?
>
> Barak
>
Hi!

Just a (late) proposal for cases like this:

Try to rationalize the values, but _not_ to full precision:

ListContourPlot[
  tbl = Rationalize[intbl={{0.42256875000000005`, 3091.38125`,
      8.271213205043878`}, {0.42256875000000005`, 3092.00625`,
      6.266039117378199`}, {0.4263187500000001`, 3091.38125`,
      5.613752062730342`}, {0.4263187500000001`,
      3092.00625`, -5.684341886080802`*^-14}, {0.4263187500000001`,
      3092.63125`, 5.599651386371079`}, {0.43006875000000006`,
      3092.00625`, 6.059667975471868`}}, 10^-$MachinePrecision]]

works great on Version 8.01/Win7-64 and reveals a set of levels of 
contours like concentric squares.
  But be sure, not to use "Rationalize[....,0]"!


As a measure for the error,

tbl - intbl // Flatten // Norm

--> 8.98526*10^-16

seems small enough to me.

Cheers,
Peter

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