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by joswig
26 May 2011, 20:57
Forum: Helpdesk
Topic: properties insufficient to compute 'INEQUALITIES'?
Replies: 2
Views: 5031

Re: properties insufficient to compute 'INEQUALITIES'?

You probably want to ask for FACETS anyway. INEQUALITIES are for input only.
by joswig
26 May 2011, 17:54
Forum: Helpdesk
Topic: Constructing half integer polytopes
Replies: 3
Views: 6780

Re: Constructing half integer polytopes

Probably you want to classify up to linear or affine automorphisms (which is almost the same). This can be translated into computing automorphisms of certain colored graphs, see Section 3.2 in the following paper: Bremner, David(3-NB-FC); Dutour Sikiric, Mathieu(CT-IRBO-SOC); Schürmann, Achill(D-MAG...
by joswig
22 May 2011, 12:15
Forum: Helpdesk
Topic: Segmentation fault and 2.9.9 vs. 2.9.10
Replies: 3
Views: 5730

Re: Segmentation fault and 2.9.9 vs. 2.9.10

Let me add a remark: It is a global design decision that the polymake objects are only functional within their specification. This means a segfault is always possible if you do something wrong (like here). One could argue that this is inconvenient. However, math says that it is virtually impossible ...
by joswig
18 May 2011, 09:39
Forum: Helpdesk
Topic: Visualizing Cones
Replies: 1
Views: 4323

Re: Visualizing Cones

Listing the vertex coordinates (e.g., of an associahedron) is accomplished by print associahedron(3)->VERTICES; Did you read our tutorials? Please look at http://www.polymake.org/doku.php/tutorial/coordinates . Visualizing 3-dimensional unbounded polyhedra works like for ordinary polytopes. However,...
by joswig
13 May 2011, 09:53
Forum: Helpdesk
Topic: tutorial on LP
Replies: 10
Views: 13041

Re: tutorial on LP

If I may add: it's worth to try the shell version (where you would have to replace "." by "->", that is, for instance, LP->MAXIMAL_VALUE) since there you have tab-completion to tell you the properties available, even with the correct spelling. ;-)
by joswig
12 May 2011, 13:31
Forum: Helpdesk
Topic: tutorial on LP
Replies: 10
Views: 13041

Re: tutorial on LP

... and, of course, the polymake version, the operating system etc.
by joswig
04 May 2011, 18:22
Forum: Helpdesk
Topic: initializing incidence matrices through perl::Object
Replies: 2
Views: 5022

Re: initializing incidence matrices through perl::Object

The confusion comes from mixing two (very different) kinds of objects. Things like Polytope<Rational>, SimplicialComplex, Graph, ... are big objects which live on the Perl side with properties and rules and such. But there are also small objects which live on the C++ side, e.g., Matrix<Rational>, Ve...
by joswig
14 Apr 2011, 16:42
Forum: Helpdesk
Topic: script "tarballs" not working
Replies: 5
Views: 9201

Re: script "tarballs" not working

Actually, -O1 is quite harsh (in terms of performance). Another option (if performance does matter) build a vanilla gcc 4.3 or 4.4 from scratch and use that one.
by joswig
21 Mar 2011, 18:18
Forum: Helpdesk
Topic: Projections
Replies: 7
Views: 9983

Re: Projections

As it seems there is something terribly wrong with the installation at TU Berlin. Similar problems from there have been reported before. The current version 2.9.9 is extremely simple to install, even locally. You should try to get a correct installation.
by joswig
19 Feb 2011, 18:50
Forum: Helpdesk
Topic: check faces in simplicial complexes
Replies: 4
Views: 7472

Re: check faces in simplicial complexes

Well, you should write a short loop and check that set for containment in all facets.

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