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by paffenholz
09 May 2011, 20:13
Forum: Helpdesk
Topic: Packing a tarball
Replies: 1
Views: 3654

Re: Packing a tarball

This is unfortunately a known bug in version 2.9.9. So you can either install version 2.9.10, where this bug is fixed, or you save all your polytopes individually and tar.gz them outside polymake (no subdirectories). Loading an existing tarball also works in 2.9.9.
by paffenholz
15 Apr 2011, 23:52
Forum: Helpdesk
Topic: Fans, and Gfan
Replies: 2
Views: 4678

Re: Fans, and Gfan

Currently you can still download the preview of the next version that we produced for our recent workshop. It contains the application fan. Note however that this application is still incomplete and some computations may fail or produce wrong results.
by paffenholz
14 Apr 2011, 16:52
Forum: Helpdesk
Topic: script "tarballs" not working
Replies: 5
Views: 8946

Re: script "tarballs" not working

The failure of the tarball script is a known error in 2.9.9. You will need version 2.9.10 if you want to use it.
by paffenholz
17 Feb 2011, 08:47
Forum: Helpdesk
Topic: H-representation to V-representation
Replies: 4
Views: 9938

Re: H-representation to V-representation

This is not a problem. polymake works with the homogenization of a polyhedron. The computed VERTICES have an additional first coordinate, which is either 0 or 1. Those rows with a leading 1 are the "true vertices" of the polyhedron, those that start with a 0 are the rays of the characteris...
by paffenholz
16 Feb 2011, 13:50
Forum: Helpdesk
Topic: H-representation to V-representation
Replies: 4
Views: 9938

Re: H-representation to V-representation

polymake links with cddlib and lrslib for convex hull computations, there is no standalone version of cdd included that would work without polymake. polymake also contains its own implementation of beneath-beyond, and an interface to ppl. As shown in the example in the previous post, in polymake you...
by paffenholz
16 Feb 2011, 11:20
Forum: Installing polymake
Topic: ERROR: Package "Polytope" does not exist
Replies: 3
Views: 7737

Re: ERROR: Package "Polytope" does not exist

polymakes needs to know about the application it should load to work with the script, so in your case you should start your file with

Code: Select all

use application 'polytope';
That should hopefully solve the issue.

Andreas
by paffenholz
13 Feb 2011, 17:28
Forum: Helpdesk
Topic: Projections
Replies: 7
Views: 9688

Re: Projections

The coordinates you want to project on should be handed to the function as an array of integers, so use "[" instead of "{". You also don't need to specify the homogenization coordinate, it will be preserved automatically. Your example should work if you use $R=projection($P,[1,2,...
by paffenholz
08 Feb 2011, 17:39
Forum: Helpdesk
Topic: integer hull
Replies: 4
Views: 9956

Re: integer hull

is the script "gc_closure" available for download? I am sorry, I was too quick with my answer. The script is unfortunately not included in the current release 2.9.9 as it builds on things only available in the next release (computations with cones), so it won't help to make this available...
by paffenholz
26 Jan 2011, 23:39
Forum: Helpdesk
Topic: integer hull
Replies: 4
Views: 9956

Re: integer hull

There is also a script "gc_closure" that takes a rational polytope and returns its Chvatal-Gomory closure. Iterating this could be faster than computing all lattice points in the polytope. Scripts have to be loaded first: script("gc_closure"); If $p is your rational polytope, the...

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