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by joswig
05 May 2013, 11:45
Forum: Helpdesk
Topic: Voronoi Tessellation with "cdd" and "beneath_beyond"
Replies: 9
Views: 10866

Re: Voronoi Tessellation with "cdd" and "beneath_beyond"

Ewgenij's recommendation polytope > $Verbose::rules=3; polytope > my $points=new Matrix<Rational>([[1,-1,-1],[1,1,-1],[1,-1,1],[1,1,1],[1,0,0]]); $p=new Polytope<Rational>(POINTS=>$points); prefer_now "beneath_beyond";$p->DUAL_GRAPH->ADJACENCY; save($p,"OUTPUT.xml"); results in r...
by joswig
02 May 2013, 16:51
Forum: Helpdesk
Topic: Partial results from FACETS
Replies: 1
Views: 4585

Re: Partial results from FACETS

Unfortunately, the current setup does not allow for much logging information for the convex hull computations. I clearly understand that this is desirable though. We started to look into some possibilities. Stay tuned. We do not allow partial output. This has to do with the overall design of polymak...
by joswig
27 Mar 2013, 19:34
Forum: Helpdesk
Topic: Homology
Replies: 5
Views: 6826

Re: Homology

The data type of the HOMOLOGY property is a bit special; actually it is Array<HomologyGroup<Integer>>. This is how you can address an individual group: topaz > $rp2=projective_plane(); topaz > print $rp2->HOMOLOGY->[1]; {(2 1)} 0 Each homology group more or less works like an array (of a pair and a ...
by joswig
26 Mar 2013, 23:44
Forum: Helpdesk
Topic: Problems with the visualisation of a fan
Replies: 2
Views: 4397

Re: Problems with the visualisation of a fan

when I visualise a fan via jreality, the output has way more cones than I expect. It seems that cones with more than three rays are subdivided, so that each cone has only three rays. Is that a feature or a bug? With the jReality window active press "alt-shift-left", which opens an extra p...
by joswig
24 Mar 2013, 22:08
Forum: Helpdesk
Topic: lrs_alloc_dat(NULL) -> segfault
Replies: 1
Views: 3691

Re: lrs_alloc_dat(NULL) -> segfault

It seems you are using a version of lrslib other than the one shipped with polymake. Your patch is not necessary for polymake's lrslib. The polymake version fixes a few glitches of the original.
by joswig
10 Mar 2013, 12:28
Forum: Helpdesk
Topic: does SymmetricFan work?
Replies: 1
Views: 3647

Re: does SymmetricFan work?

Please give your complete code example. I suspect that LINEALITY_SPACE is missing in your input. RAYS only do not work.
by joswig
07 Mar 2013, 23:35
Forum: Helpdesk
Topic: Vertex labels vs indices
Replies: 3
Views: 5687

Re: Vertex labels vs indices

What about the following? topaz > $sc=new SimplicialComplex(INPUT_FACES=>[[5,6,8],[6,8]]); topaz > print rows_labeled($sc->FACETS,undef,$sc->VERTEX_INDICES); 0:5 6 8 The second parameter "undef" can be replaced by something meaningful if you also want to give names to the facets.
by joswig
13 Feb 2013, 10:46
Forum: Helpdesk
Topic: compute volume using callable library
Replies: 8
Views: 8729

Re: compute volume using callable library

Must I always use Polytope<Rational>? Well, if you want to get exact results: yes. However, I should also point out that there are other exact data types, such as QuadraticExtension<Rational>. The data type Polytope<Float> must be used with care since the combinatorics of such polytopes might not b...
by joswig
09 Feb 2013, 10:01
Forum: Helpdesk
Topic: Trivial 0 >= -1 inequality among the facets
Replies: 3
Views: 5471

Re: Trivial 0 >= -1 inequality among the facets

But what you write means that the returned number of facets print $p->N_FACETS; is only correct if $p is bounded. (Of course I can live with that.) polymake's polytope semantics describes a projectively equivalent (bounded) polytope for every possibly unbounded polyhedron. Not every unbounded polyh...
by joswig
25 Jan 2013, 15:41
Forum: General Discussion
Topic: Public access to polymake svn repository?
Replies: 2
Views: 11437

Re: Public access to polymake svn repository?

We are in the middle of preparing svn-snapshots (which are supposed to be slightly more stable than a random checkout). You might want to try today's version 20130125. Stay tuned for more info in our wiki.

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