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by joswig
25 Aug 2019, 12:10
Forum: Helpdesk
Topic: Unexpected behavior when finding regular subdivisions
Replies: 1
Views: 9

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: 81

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: 81

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...
by joswig
21 Aug 2019, 16:08
Forum: Helpdesk
Topic: polytope over quadratic number fields
Replies: 10
Views: 81

Re: polytope over quadratic number fields

A second potential source of error could be that there are competing conventions as far as names are concerned. Here is one line of polymake code which generates all Johnson solids and lists their names and f-vectors. polytope> for (my $k=1; $k<=92; ++$k) { $j = johnson_solid($k); $_=$j->description...
by joswig
21 Aug 2019, 15:56
Forum: Helpdesk
Topic: polytope over quadratic number fields
Replies: 10
Views: 81

Re: polytope over quadratic number fields

The following is computed with polymake 3.4 and confirmed with the brand new version 3.5: polytope > print rhombicosidodecahedron()->F_VECTOR; 60 120 62 polytope > print truncated_dodecahedron()->F_VECTOR; 60 90 32 At least these two seem to agree with yours. It also works with the Julia interface P...
by joswig
16 Jun 2019, 13:29
Forum: General Discussion
Topic: another questions re: vert(hom(p, q))
Replies: 1
Views: 8918

Re: another questions re: vert(hom(p, q))

Each point in the mapping polytope/Hom-polytope is encoded as the constant 1 (for homogenization) plus a matrix encoded as consecutive row vectors. That matrix encodes a projective transformation (yielding affine coordinates, however), such that it can be applied to points in the polytope correspond...
by joswig
15 Apr 2019, 16:40
Forum: News
Topic: polymake 3.4 released
Replies: 0
Views: 576

polymake 3.4 released

Dear polymakers, we are happy to inform you that version 3.4 of polymake appeared today. We moved to more rapid development cycle, aiming at four releases per year. So stay tuned for the next release, which is scheduled for July 15 already. As usual we are happy about any feedback that you might giv...
by joswig
05 Apr 2019, 09:45
Forum: Helpdesk
Topic: Determining version
Replies: 7
Views: 372

Re: Determining version

As Ewgenij had pointed out, calling > polymake-config --version 3.3 from the terminal shell is the standard way to learn about the polymake version. The executable polymake-config is installed alongside the actual polymake. There are also many other things that you can figure out about the installat...
by joswig
26 Mar 2019, 09:35
Forum: Helpdesk
Topic: Problem with Installing Polymake
Replies: 7
Views: 414

Re: Problem with Installing Polymake

Do you know any way to install XML::LibXSLT? I am on a linux machine if that clarifies anything.
Most distributions have this as a package. What is your setup, exactly?
by joswig
22 Mar 2019, 12:02
Forum: Helpdesk
Topic: The root_system function
Replies: 8
Views: 446

Re: The root_system function

Please tell us which polymake version your are using on which operating system. Did you compile from source code (then, please, send your file build/config.ninja), or did you use some precompiled version from some package manager (which?).

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