Opened 22 months ago

Last modified 3 months ago

#31405 new enhancement

Documentation to "Functions for plotting polyhedra". more details wanted

Reported by: Günter Rote Owned by:
Priority: minor Milestone: sage-9.8
Component: documentation Keywords: Schlegel diagram, documentation, polytope
Cc: Jean-Philippe Labbé, gh-kliem, Laith Rastanawi Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

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Description

doc/sage/html/en/reference/discrete_geometry/sage/geometry/polyhedron/plot.html

1) Apparently, schlegel_projection works only for 4d to 3d. Or also for 3d to 2d? (That would be nice to have.) 5d to 4d? Please mention

2) There is no such thing as a "stereographic projection" of a polytope. Stereographic projection is a mapping between a sphere and a hyperplane. What this really is is just a central projection, from some point. (like the Schlegel diagram as well, except that the projection center is constrained). Where is the image hyperplane? Probably perpendicular to the vector from 0 to the projection center? Can that point be 0? Does the projection plane go through the origin, or does it touch the unit ball? What happens if the point lies inside the unit ball?

3) Is there no parallel projection? (or special case orthogonal projection) Or is it in some other module?

Change History (8)

comment:1 Changed 22 months ago by Matthias Köppe

Cc: Jean-Philippe Labbé gh-kliem added

comment:2 Changed 22 months ago by Laith Rastanawi

Cc: Laith Rastanawi added

comment:3 Changed 21 months ago by Jean-Philippe Labbé

Authors: Günter Rote
Keywords: polytope added
Type: PLEASE CHANGEenhancement

Ok, will address these questions ASAP.

comment:4 Changed 20 months ago by Matthias Köppe

Milestone: sage-9.3sage-9.4

Sage development has entered the release candidate phase for 9.3. Setting a new milestone for this ticket based on a cursory review of ticket status, priority, and last modification date.

comment:5 Changed 16 months ago by Matthias Köppe

Milestone: sage-9.4sage-9.5

comment:6 Changed 11 months ago by Matthias Köppe

Milestone: sage-9.5sage-9.6

comment:7 Changed 8 months ago by Matthias Köppe

Milestone: sage-9.6sage-9.7

comment:8 Changed 3 months ago by Matthias Köppe

Milestone: sage-9.7sage-9.8
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