[Gnuplot-info] gnuplot bug report

[Serguei V. <ser...@p-...>]

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Hi,

Could you please help us ? It seems that we found a bug while using
splot with linespoints.

It can be seen with the second of the two attached (gzipped) files.
The problem we solved is the building and consequent separating the
Minimal Spanning Tree (MST). There is only one MST connecting a number
of points (here, in our example, on the sphere), which connects all the
points, have minimal length and no loops.

The built MST is OK (see the first file,
"splot 'mst.data_MC.0.output' w linespoints"). However, when the tree is
separated (edges longer than the average edge length are removed), some
of the resulting subtrees are drawn with loops. As an example, there is
a triangle (i.e. a loop-like structure) formed by the points

0.127579 -0.187542 -0.973936
0.119599 -0.195573 -0.973369
0.148943 -0.139136 -0.979008

However, in the second output file there are only two out of three
triangle edges, as it should be:

0.127579 -0.187542 -0.973936
0.119599 -0.195573 -0.973369

0.127579 -0.187542 -0.973936
0.148943 -0.139136 -0.979008

So, why Gnuplot plots a triangle in this particular case ?
Thank you very much in advance for your answer !

Best wishes,
Serguei.


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Serguei Vorobiov

 phone: +386 5 3315 225
   fax: +386 5 3315 385

Laboratory for astroparticle physics
University of Nova Gorica, Vipavska 13, POB 301
SI-5001 Nova Gorica, Slovenia
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