Thu 29 Aug 2013 11:08:55 PM UTC, comment #3:
This appears to be a gnuplot bug, rather than an Octave bug.
In the intervening years, the situation has gotten better. With the development branch of Octave and gnuplot 4.6.2 I no longer see problems 1 and 2. There are still some lines extending beyond the axis boundaries, but, again, this seems to be the fault of gnuplot. If I change the x-axis limits from [-1 1] to [-1.0001 1] then the figure draws correctly.
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Thu 05 May 2011 07:35:46 PM UTC, original submission:
Plotting the unit sphere so that it is bisected in the yz plane (at the edge of a plot, in the example shown below through x = -1), then specifying 'hidden off' as follows:
leads to three problems
1) two additional lines, unrelated to the sphere, appear (from the "south pole" in directions that comprise various resultants of the positive x and z axes)
2) mesh lines are missing from parts of the great plane of bisection
3) additional mesh lines appear:
from the "north pole" - lines of longitude" up to, but not including, the second "line of latitude";
from one of (the two) "lines of longitude" in the bisected plane, - "lines of latitude", up to, but not including, the second "line of longitude", of the two omitted by the bisection. The lines pass directly from the "line of longitude" that is plotted, to the position of the nodes with the "line of longitude".
I understand (from a thread in the Nabble forum) that the problem also occurs with Portable Octave 3.0.0 under windows/cygwin (see http://octave.1599824.n4.nabble.com/quot-axis-scale-dataspectratio-quot-problem-with-3D-graph-td3491951.html)
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