Opened 3 years ago
Last modified 3 years ago
#28646 closed enhancement
Use CombinatorialPolyhedron to obtain faces of polyhedra — at Version 13
Reported by:  ghkliem  Owned by:  

Priority:  major  Milestone:  sage9.1 
Component:  geometry  Keywords:  polytopes, combinatorial polyhedron 
Cc:  jipilab, ghLaisRast  Merged in:  
Authors:  Jonathan Kliem  Reviewers:  JeanPhilippe Labbé 
Report Upstream:  N/A  Work issues:  
Branch:  public/28646reb (Commits, GitHub, GitLab)  Commit:  4d53c14735f3435fe91d876d336a1af104997015 
Dependencies:  Stopgaps: 
Description (last modified by )
We use CombinatorialPolyhedron
to obtain the faces of fixed dimensions of a polyhedron.
We add a method face_generator
, which iterates over all faces (possibly of fixed dimension).
With this ticket we can obtain the faces much faster and without generating the entire face lattice. The iterator is a true iterator in the sense that it has almost constant memory usage and does and no point store a list of all faces.
This ticket changes the order of the output of faces
.
Change History (13)
comment:1 Changed 3 years ago by
 Branch set to public/28646
 Commit set to ca5405111f0733513f8a1010b4237d4a4c644280
 Dependencies set to #28625
 Status changed from new to needs_review
comment:2 Changed 3 years ago by
 Commit changed from ca5405111f0733513f8a1010b4237d4a4c644280 to 6828a751122c3f9f779f21a914788b79110dfeda
Branch pushed to git repo; I updated commit sha1. New commits:
6828a75  avoid import of PolyhedronFace; use existing method

comment:3 followup: ↓ 5 Changed 3 years ago by
 Reviewers set to JeanPhilippe Labbé
 Status changed from needs_review to needs_work
I would vote to change face_dimension
to simply dimension
.
The INPUT of combinatorial_face_to_polyhedral_face
is too verbose to me.
A Polyhedron
, the polyhedron containing the face
A CombinatorialFace
OUTPUT:
A PolyhedronFace
is sufficient. If you insist to have the links on the documentation ok... But I would not be too verbose here.
comment:4 Changed 3 years ago by
 Commit changed from 6828a751122c3f9f779f21a914788b79110dfeda to d85f05534c216adedb07174a5f155e63007c0986
Branch pushed to git repo; I updated commit sha1. New commits:
d85f055  simplified input/output

comment:5 in reply to: ↑ 3 Changed 3 years ago by
Replying to jipilab:
I would vote to change
face_dimension
to simplydimension
.
This is to be consistent with the method faces
`.
comment:6 Changed 3 years ago by
 Status changed from needs_work to needs_review
comment:7 Changed 3 years ago by
 Dependencies changed from #28625 to #28625, #17215
There will be a conflict with #17215.
comment:8 Changed 3 years ago by
 Branch changed from public/28646 to public/28646reb
 Commit changed from d85f05534c216adedb07174a5f155e63007c0986 to d9cb64930ee3473eea787cf91136a71d04488163
 Dependencies changed from #28625, #17215 to #17215
Rebased
New commits:
d9cb649  polyhedron uses CombinatorialPolyhedron for :meth:`faces`; added :meth:`face_generator`

comment:9 Changed 3 years ago by
 Commit changed from d9cb64930ee3473eea787cf91136a71d04488163 to 849e09a9e95523b3e742f4c6f2e4fd48f65bdd3d
Branch pushed to git repo; I updated commit sha1. New commits:
849e09a  fixed a new failing test

comment:10 Changed 3 years ago by
 Commit changed from 849e09a9e95523b3e742f4c6f2e4fd48f65bdd3d to 4d53c14735f3435fe91d876d336a1af104997015
Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:
a4c3025  polyhedron uses CombinatorialPolyhedron for :meth:`faces`; added :meth:`face_generator`

5f284dd  avoid import of PolyhedronFace; use existing method

d15170d  simplified input/output

4d53c14  fixed a new failing test

comment:11 Changed 3 years ago by
 Description modified (diff)
comment:12 Changed 3 years ago by
 Status changed from needs_review to positive_review
The tests all pass on my end. face_generator runs for every type of polytope it should run on, and combinatorial_face_to_polyhedral_face runs as it should. The change in order experienced by the various face functions only affected the lists, not the correctness.
comment:13 Changed 3 years ago by
 Dependencies #17215 deleted
 Description modified (diff)
Removing the dependency.
#17215 will need small changes in the doctests, once it's done.
I accidentally pulled #28625 instead of #28621. As #28625 is closed, I don't feel like fixing the branch.
New commits:
added combinatorial polyhedron as an attribute for polyhedra
Merge branch 'public/28607' of git://trac.sagemath.org/sage into public/28621
used CombinatorialPolyhedron to compute f_vector
give an error message for polytopes in some cases; removed incorrect example
now we get a precice error message for inexact truncated dodecahedron
subsequent calls for f_vector fail if first attempt fails
Merge branch 'public/28625' of git://trac.sagemath.org/sage into face_iter
polyhedron uses CombinatorialPolyhedron for :meth:`faces`; added :meth:`face_generator`