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by joswig
27 Jul 2021, 12:19
Forum: Helpdesk
Topic: Checking if two fans have the same support
Replies: 1
Views: 66

Re: Checking if two fans have the same support

Indeed, currently polymake does not have such a function. Of course, it is absolutely desirable. We started to discuss the matter within the developer's team. There are several ways to implement this, all of which are computationally costly, except for small fans in very low dimensions. We are in th...
by joswig
11 Jun 2021, 17:16
Forum: Helpdesk
Topic: Stable intersection not contained in set-theoretic intersection
Replies: 6
Views: 284

Re: Stable intersection not contained in set-theoretic intersection

That's a difficult question in the sense that these functions reside in Simon Hampe's extension atint, which became bundled a while ago. Thing is: no-one is currently working on that code.

Nonetheless, we will check. Just be a bit patient, please.
by joswig
02 Jun 2021, 09:23
Forum: Helpdesk
Topic: Issues solving an LP
Replies: 6
Views: 715

Re: Issues solving an LP

polymake employs a homogeneous coordinate model. That is, here and elsewhere you need to ignore the leading "1" in the solution.
by joswig
20 May 2021, 09:29
Forum: Helpdesk
Topic: Issues solving an LP
Replies: 6
Views: 715

Re: Issues solving an LP

There are two issues. (1) There is a small glitch in polymake's design of subobject properties (such as LP or MILP). The following works: > $x = lp2poly("untitled.lp"); > $obj= new Vector([1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]); > $x->MILP(LINEAR_OBJECTIVE=...
by joswig
24 Apr 2021, 18:31
Forum: Helpdesk
Topic: How to define Matrix Group from generators?
Replies: 3
Views: 447

Re: How to define Matrix Group from generators?

There is no actual support of matrix groups in polymake. Our groups are usually permutation groups. There is only some very limited functionality to convert between matrices and permutations. If you need the full strength of matrix groups (and polyhedral geometry) you should use Oscar , which will b...
by joswig
16 Apr 2021, 09:33
Forum: Helpdesk
Topic: Segmentation fault when using Polymake in Julia
Replies: 8
Views: 630

Re: Segmentation fault when using Polymake in Julia

That polyhedron is unbounded; so the function says it cannot count the lattice points.

Notice the extra inequality "1 0 0" (which amounts to 1 >= 0) that was added by polymake to your input. This is useful for combinatorial reasons:
https://polymake.org/doku.php/user_guid ... oordinates
by joswig
13 Apr 2021, 10:24
Forum: Helpdesk
Topic: Trouble interpreting the output (facets of a polytope)
Replies: 6
Views: 594

Re: Trouble interpreting the output (facets of a polytope)

Please send your full input and output, at least for a minimal example which exhibits the problem.
by joswig
23 Dec 2020, 12:51
Forum: Helpdesk
Topic: Documentation for file command line interface
Replies: 3
Views: 1512

Re: Documentation for file command line interface

The following variant of the tutorial code is more generic and thus probably even better suited for your needs:

Code: Select all

polymake 'my $c=load("c3.poly"); print "$_\n", $c->$_, "\n\n" for "N_VERTICES", "N_FACETS";'
You can add as many properties as you like.
by joswig
21 Oct 2020, 09:52
Forum: Helpdesk
Topic: Tropical Polytope Visualization
Replies: 1
Views: 1170

Re: Tropical Polytope Visualization

Please give more details: which polymake version on which operating system are you running? Which visualization backend?

Also please give the entire sequence of commands leading to the error.

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