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by joswig
31 Jan 2012, 19:14
Forum: Helpdesk
Topic: obtaining information from incidence matrices
Replies: 3
Views: 6328

Re: obtaining information from incidence matrices

I hope the following example explains a little how to use incidence matrices. polytope > $M=new IncidenceMatrix([[0,1,2],[0,2,3],[0,1,19]]); polytope > print $M; {0 1 2} {0 2 3} {0 1 19} polytope > print $M->rows(); 3 polytope > print $M->cols(); 20 Now, the following gives an error. polytope > prin...
by joswig
23 Jan 2012, 10:36
Forum: Helpdesk
Topic: RelInt Lattice Points
Replies: 3
Views: 5360

Re: RelInt Lattice Points

Right now there is no such function. However, there is a function to enumerate all lattice points in a rational polytope. polytope > print simplex(2,2)->LATTICE_POINTS; 1 0 0 1 0 1 1 0 2 1 1 0 1 1 1 1 2 0 And, there is a related function for the interior lattice points. polytope > print simplex(2,2)...
by joswig
23 Jan 2012, 10:33
Forum: Helpdesk
Topic: Hom-, or Mapping-Polytopes
Replies: 2
Views: 4392

Re: Hom-, or Mapping-Polytopes

Here is one example: polytope > $m=mapping_polytope(simplex(2),cube(2)); polytope > print $m->N_VERTICES; 64 For more information on creating polytopes and such please look at the tutorials . Also useful is polymake's online help functionality. polytope > help "mapping_polytope"; functions...
by joswig
13 Jan 2012, 14:58
Forum: Helpdesk
Topic: Subsets_of_k broken?
Replies: 3
Views: 5068

Re: Subsets_of_k broken?

Which compiler, which Perl version, and which operating system are you using?
by joswig
02 Jan 2012, 14:14
Forum: General Discussion
Topic: Polymake & OpenMP
Replies: 2
Views: 11081

Re: Polymake & OpenMP

I think, first of all we have to discuss the most probable and promising use cases of parallelization, and then carefully introduce the necessary support for it step by step. Probably it would be an interesting topic in the agenda of the upcoming workshop in March. I am quite sure that starting wit...
by joswig
29 Nov 2011, 13:01
Forum: General Discussion
Topic: pypolymake: A Sage Interface to polymake
Replies: 10
Views: 56711

Re: pypolymake: A Sage Interface to polymake

I now got it installed, thanks for your comments. Only the visualization doesn't yet work: sage: p.visual() polymake: WARNING: stored preference statements for label jreality are not in effect - probably excluded by auto-configuration sage: ERROR: ld.so: object '/home/stumpc5/progs/sage-4.7.1/local...
by joswig
25 Nov 2011, 10:17
Forum: Installing polymake
Topic: Installing 2.9.10 or 2.10 on Ubuntu 11.10
Replies: 4
Views: 7845

Re: Installing 2.9.10 or 2.10 on Ubuntu 11.10

That's not a bug. It is a mere warning coming from within libreadline (or rather its perl wrapper). It has nothing to do with polymake (except for the fact that polymake is triggering this by calling libreadline via perl).
by joswig
30 Oct 2011, 13:27
Forum: Helpdesk
Topic: Problems with script ”gc_closure”
Replies: 3
Views: 5268

Re: Problems with script ”gc_closure”

There is a sign error in the script. Please change line 28 of apps/polytope/scripts/gc_closure to my $obj=-(new Vector<Rational>(0 | $this_vector)); At some point we changed the orientation of the normal cones, but we forgot to modify this script accordingly. Sorry for the inconvenience. Will be fix...
by joswig
30 Oct 2011, 13:00
Forum: General Discussion
Topic: pypolymake: A Sage Interface to polymake
Replies: 10
Views: 56711

pypolymake: A Sage Interface to polymake

There is a new attempt to create an interface from Sage to polymake. This thread is meant to report on this development and to discuss how to proceed. To answer the obvious question of why this is not discussed in the developer's forum: the topic seems to be of interest to a wider audience, and the ...
by joswig
17 Oct 2011, 16:00
Forum: Helpdesk
Topic: Defining not pointed polyhedra via POINTS
Replies: 8
Views: 9546

Re: Defining not pointed polyhedra via POINTS

Is this approach ok?
Yes, this is OK. Sorry for the inconvenience. I did not pay attention to the change Ewgenij mentioned above. My bad.

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