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by joswig
30 Jan 2020, 10:55
Forum: News
Topic: polymake 4.0 released
Replies: 0
Views: 74

polymake 4.0 released

This is to announce the release of polymake 4.0. We bumped up the version major number in order to mark a few breaking changes, which resulted in some major reshuffling behind the scenes. However, most of these will only affect the programmers among the polymake users: * Data file format switched fr...
by joswig
10 Dec 2019, 11:25
Forum: Helpdesk
Topic: Progress while computing H-representation
Replies: 3
Views: 177

Re: Progress while computing H-representation

If you have an server with multiple cores (like 20), which algorithm can make use of this? Where do i find information on this? Again, please consult that paper ;-) There are currently two parallel convex hull codes available (that I am aware of): normaliz and lrs (in its mplrs version). The polyma...
by joswig
06 Dec 2019, 11:35
Forum: Helpdesk
Topic: Progress while computing H-representation
Replies: 3
Views: 177

Re: Progress while computing H-representation

Questions like these appeared in this forum in several guises (and have been answered, see, e.g., https://forum.polymake.org/viewtopic.php?f=8&t=1693 ). I am aware, however, that for non-experts it may not be obvious that these questions are essentially the same. So I answer them again. 1. When I ca...
by joswig
19 Nov 2019, 14:49
Forum: News
Topic: polymake 3.6 released
Replies: 0
Views: 623

polymake 3.6 released

This is to announce the release of polymake 3.6. This time we mainly focused on new mathematical concepts and algorithms. In particular we now have: compactifications of tropical hypersurfaces; see Kastner, Shaw and Winz, arXiv:1612.09526 (implementation by the authors) tropical Voronoi diagrams; se...
by joswig
29 Aug 2019, 10:32
Forum: News
Topic: polymake 3.5 released
Replies: 0
Views: 930

polymake 3.5 released

This is to announce the release of polymake 3.5 . Highlights include the following: Thanks to Lars' effort there is new big object type HyperplaneArrangement in application fan. Its key algorithm allows to compute the induced cell decomposition of the surrounding Euclidean space. Moreover, there are...
by joswig
29 Aug 2019, 10:23
Forum: Helpdesk
Topic: affine dependencies of a polytope
Replies: 2
Views: 362

Re: affine dependencies of a polytope

Yes, it works as follows. Let us take the standard square as an example. Your question is about the matroid generated by the vertices. polytope > $V=cube(2)->VERTICES; polytope > $M = new matroid::Matroid(VECTORS=>$V); polytope > print $M->BASES; {0 1 2} {0 1 3} {0 2 3} {1 2 3} Each line describes o...
by joswig
27 Aug 2019, 13:32
Forum: Helpdesk
Topic: Visualization using Ubuntu
Replies: 3
Views: 363

Re: Visualization using Ubuntu

From your description alone it is impossible to say what went wrong. Among other details, in particular, the polymake version number is missing. Most likely, however, it will be a java related issue. Maybe you can try > threejs(simplex(3)->VISUAL); which triggers basic visualization through your web...
by joswig
25 Aug 2019, 12:10
Forum: Helpdesk
Topic: Unexpected behavior when finding regular subdivisions
Replies: 1
Views: 255

Re: Unexpected behavior when finding regular subdivisions

The difference is that fan::SubdivisionOfPoints takes homogeneous coordinates, whereas topaz::GeometricSimplicialComplex does not.
by joswig
23 Aug 2019, 12:08
Forum: Helpdesk
Topic: polytope over quadratic number fields
Replies: 10
Views: 700

Re: polytope over quadratic number fields

Indeed, this is a gap in the documentation. Thanks for pointing this out. I just made an addition to https://polymake.org/doku.php/user_guide/tutorials/coordinates , which will become visible not before tomorrow (after the automated update). Here it comes. polymake has limited support for other orde...
by joswig
21 Aug 2019, 16:16
Forum: Helpdesk
Topic: polytope over quadratic number fields
Replies: 10
Views: 700

Re: polytope over quadratic number fields

A third source of error is that some of the Johnson solids are represented with float coordinates, i.e., coordinate-wise in an inexact way. E.g., polytope > $j = johnson_solid(9); $_=$j->description; chomp; print "$_: ", $j->F_VECTOR, " ", $j->type->full_name, "\n"; Johnson solid J9: Elongated penta...

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