On Thu, May 15, 2008 at 11:11 PM, mhampton <[EMAIL PROTECTED]> wrote: > > I thought I would publicly state my own plans on this front, and some > recent developments. > > Polymake is undergoing some architectural changes that may or may not > make it more attractive for inclusion in sage. Their developers > estimate the new release as sometime in the summer, maybe as early as > June. In the meantime, I think it makes sense to extend our > functionality by including some of the small, specialized projects out > there that polymake also uses. I am currently working on an lrs spkg > - lrs is an alternative to cddlib for many computations, and in some > cases it is much faster. Mike Hansen and Michael Abshoff have been > looking at some other projects like LattE and 4ti2. > > This summer I will also spend some time improving code for 2- and 3-D > plotting of polytopes - my first project is to write a Schlegel > diagram function. I will also be writing some code in BKK theory/ > tropical geometry that will exploit Sage's unique combination of > features from gfan, singular, and cddlib (unless there are magma > commands that I am unaware of for tropical intersections). Somewhat > more tangential, I hope to write some decent amoeba-plotting functions > in 2 and 3D.
This sounds interesting!! > > -M. Hampton > > On Mar 29, 11:25 pm, mhampton <[EMAIL PROTECTED]> wrote: >> The toric package does seem relevant, but it is unclear to me exactly >> where it overlaps the functionality of cddlib, PALP, and polymake and >> where it provides complementary functions. Also, in the areas where >> it overlaps it would be interesting to know how it compares in speed. >> Are there any benchmarks on that? >> >> Since GAP is standard in Sage, presumably adding toric would be pretty >> easy, yes? >> >> -M. Hampton >> >> On Mar 29, 4:17 pm, "David Joyner" <[EMAIL PROTECTED]> wrote: >> >> > On Sat, Mar 29, 2008 at 4:04 PM, mhampton <[EMAIL PROTECTED]> wrote: >> >> > > For the brave of heart, I have my current effort up on trac as ticket >> > > #2716. >> >> > > I hope to add a number of other things and make the polyhedral classes >> > > more intelligent. Again, I would appreciate any thoughts on how >> > > polyhedral objects in Sage should be organized. >> >> > I don't know how useful this is but I would like to see all the >> > "geometric" functionality >> > of the GAP package TORIC http://www.opensourcemath.org/toric/ >> > implemented. It is almost all combinatorial geometry, so this seems to me >> > relevant to what you are going. Does it seem relevant to you? >> >> > > -M. Hampton >> >> > > On Mar 29, 7:28 am, mhampton <[EMAIL PROTECTED]> wrote: >> > > > I guess my plan for the moment is to work inside sage/geometry/ >> > > >polytope, and mostly imitate the structure of the polymake interface >> > > > using only cddlib. About 90% of the functionality of polymake should >> > > > be quite easy redo. >> >> > > > -M. Hampton >> >> > > > On Mar 28, 6:46 pm, mhampton <[EMAIL PROTECTED]> wrote: >> >> > > > > Hi everybody, >> >> > > > > Recently while working on the gfan interface I starting thinking >> > > about >> > > > > adding some otherpolytope-related functionality to Sage, but I am >> > > not >> > > > > sure how it should be organized. The classes I created in gfan >> > > > > (probably to be sage-2.11) are somewhat ad-hoc. >> >> > > > > In the near future I plan on adding 3D groebner fans to the gfan >> > > > > interface; this is not something gfan itself can display. To do >> > > this >> > > > > I finally wrote some code that I have wanted for a long time: a >> > > direct >> > > > > interface to cddlib to convert back and forth from vertex >> > > descriptions >> > > > > and "facial" descriptions (i.e. inequalities/half-planes and >> > > > > equalities). (Previously I would install the optional polymake >> > > > > package to do this, but that is massive overkill for the very >> > > limited >> > > > > functionality I need.) >> >> > > > > Currently my functions just spit out the relevant data as lists, >> > > but I >> > > > > think I should encapsulate them in some sort ofPolytopeclass. This >> > > > > is not my forte so I welcome comments and suggestions. I will soon >> > > > > post some code on trac, but I think the design issue is somewhat >> > > > > independent of my particular code. >> >> > > > > Thanks, >> > > > > Marshall Hampton > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
