#12798: list_plot3d plots extraneous points at z=0 and doesn't take color or
rgbcolor as keywords
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Reporter: ppurka | Owner: jason, was
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.1
Component: graphics | Resolution:
Keywords: list_plot3d, sd40.5 | Work issues:
Report Upstream: N/A | Reviewers: Karl-Dieter Crisman
Authors: Punarbasu Purkayastha | Merged in:
Dependencies: | Stopgaps:
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Comment (by kcrisman):
Great, color works now - nice catch.
It turns out that the documentation for what this function actually does
is ''insanely'' bad. I'm going to upload a patch clarifying what it
actually does, which is not intuitive at all.
As for the issue you are seeing, I think it's very interesting. Notice
that the box that comes up ''does'' have the right dimensions to
incorporate all three points, even when you don't specify `num_points`!
Here is what is going on - I've printed out the `vals`. All those `nan`
guys will lead to not much of a plot.
{{{
sage: sage: list_plot3d([(0,0,1), (2,3,4),
(-1,-1,-1)],interpolation_type='linear')
[[ -1.00000000e+00 nan nan nan
nan nan]
[ nan 6.66133815e-16 nan nan
nan nan]
[ nan nan nan nan
nan nan]
[ nan nan nan 2.00000000e+00
nan nan]
[ nan nan nan nan
nan nan]
[ nan nan nan nan
nan nan]]
}}}
So you pick your poison here. Either you get something that does have the
right points, but then also has everything else be extended by zero, or
you don't do that, but the algorithm fails in certain cases. This will
happen whenever the "box" in question is a lot bigger than the projection
of the actual points to the xy-plane.
{{{
sage: sage: list_plot3d([(0,0,1), (2,3,4), (-1,-1,-1)]) # bad
sage: sage: list_plot3d([(0,5,1), (5,5,4), (-1,-5,-1)]) # good
}}}
I'm good with your work. If you like my changes, sign off as a reviewer
and we'll get this in.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12798#comment:10>
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