Thanks for trying this Marshall. Unfortunately, your spkg, and the older experimental spkg, for 4ti2, both fail to install on my amd64 ubuntu 9.04 machine. I have N Cohen's version of the glpk spkg installed.
On Fri, Jul 31, 2009 at 12:18 PM, Marshall Hampton<hampto...@gmail.com> wrote: > > OK, that was stupid of me, I should have looked in the experimental > packages first. There are older ones for 4ti2 and glpk, which might > solve my problems. > > -Marshall > > On Jul 31, 11:15 am, Marshall Hampton <hampto...@gmail.com> wrote: >> I'm just editing the subject line to attract attention from people >> like Mike Hansen who might have done overlapping work. >> >> -Marshall >> >> On Jul 31, 11:03 am, Marshall Hampton <hampto...@gmail.com> wrote: >> >> > I am trying to make an spkg for 4ti2, but I am having trouble getting >> > it to recognize GMP. I'm sure many people on this list are more >> > qualified than I am to figure that out. >> >> > t4i2 requires the linear programming package glpk, which I think I did >> > succeed in making an spkg for - at least it works on my mac, and its >> > pretty minimal so I would think it works on linux. >> >> > My current attempts are at: >> >> >http://www.d.umn.edu/~mhampton/4ti2.p0.spkghttp://www.d.umn.edu/~mham... >> >> > in case anyone wants to take a look and fix or improve them. >> >> > -Marshall >> >> > On Jul 27, 4:30 pm, David Joyner <wdjoy...@gmail.com> wrote: >> >> > > I'm having trouble with 4ti installation. Maybe I'm just too impatient. >> > > Do you have an spkg for it? >> >> > > On Mon, Jul 20, 2009 at 11:02 PM, davidp<dav...@reed.edu> wrote: >> >> > > > Marshall and David: thanks very much for these suggestions. >> >> > > > Dave >> >> > > > On Jul 20, 4:59 am, David Joyner <wdjoy...@gmail.com> wrote: >> > > >> On Sun, Jul 19, 2009 at 3:33 PM, davidp<dav...@reed.edu> wrote: >> >> > > >> > I have been working on a Sage package for doing computations >> > > >> > involving >> > > >> > the >> > > >> > AbelianSandpileModel. In addition, this summer I am the mentor for >> > > >> > a Google >> > > >> > Summer of Code project which is a java application for visualizing >> > > >> > and >> > > >> > analyzing sandpiles. The latest addition to the java program has >> > > >> > been >> > > >> > the >> > > >> > ability to interact with Sage. For a glance at what has been going >> > > >> > on, I would >> > > >> > recommend: >> >> > > >> > www.reed.edu/~davidp/sand >> >> > > >> > especially >> >> > > >> > www.reed.edu/~davidp/sand/sage/html/sage_sandpiles.html >> >> > > >> > and >> >> > > >> > www.reed.edu/~davidp/sand/program/program.html >> >> > > >> > It would be great to get feedback from Sage users. The Google >> > > >> > Summer >> >> > > >> I've read the papers on RR spaces of graphs, and related papers using >> > > >> tropical curves, >> > > >> so am very happy to see that this is implemented. Long ago, I looked >> > > >> at the chip-firing papers. >> > > >> However, I had no idea that these topics were related and have >> > > >> forgotten what I read >> > > >> about that aspect anyway. >> >> > > >> You asked for comments. Looking >> > > >> athttp://people.reed.edu/~davidp/sand/sage/html/sage_sandpiles.html#dis... >> > > >> andhttp://people.reed.edu/~davidp/sand/sage/html/sage_sandpiles.html#pro... >> > > >> (in other words looking at the *output* of your code and not the code >> > > >> itself), >> > > >> I have a few observations (which may or may not be useful or >> > > >> correct:-): >> >> > > >> 1) it seems to me that you have implemented rather hackish methods for >> > > >> constructing and manipulating divisors on graphs. It would be nice if >> > > >> they were implemented >> > > >> in a way similar to divisors on curves (ie, as a class with methods >> > > >> for addition, etc). >> >> > > >> 2) It seems you have a included some print statements for the r_of_D >> > > >> function: >> >> > > >> sage: r_of_D = S.r_of_D(D)[0] >> > > >> 0 >> > > >> 1 >> > > >> 2 >> > > >> sage: r_of_F = S.r_of_D(F)[0] >> > > >> 0 >> >> > > >> though I am not sure. I would suggest having r_of_D return r(D) by >> > > >> default and then >> > > >> have an option 'algorithm = "verbose"' or something if you want to >> > > >> output the divisor F >> > > >> as well. I suggest eliminating the print statements. Typically and >> > > >> assignment >> > > >> in Python (such as r_of_D = S.r_of_D(D)[0]) has no values printed to >> > > >> the screen. >> >> > > >> 3) You seem to have a non-standard method of describing a ring in >> > > >> Sage: >> >> > > >> sage: g = {0:{},1:{0:1,3:1,4:1},2:{0:1,3:1,5:1}, >> > > >> 3:{2:1,5:1},4:{1:1,3:1},5:{2:1,3:1}} >> > > >> sage: S =Sandpile(g, 0) >> > > >> sage: S.ring() >> >> > > >> // characteristic : 0 >> > > >> // number of vars : 6 >> > > >> // block 1 : ordering dp >> > > >> // : names x_5 x_4 x_3 x_2 x_1 x_0 >> > > >> // block 2 : ordering C >> >> > > >> It seems to me the print method should, again, mirror that of the >> > > >> base_ring method for an algebraic curve. >> >> > > >> Overall though I think this is extremely interesting code and I'm >> > > >> looking forward >> > > >> to playing with it a lot more! This week I'm helping with advising >> > > >> new freshmen >> > > >> who will be starting classes this fall, but will try to give you more >> > > >> detailed >> > > >> comments as soon as I can. >> >> > > >> > of Code >> > > >> > project will end in August, so if there are any features you would >> > > >> > like us to >> > > >> > add to the java application, please let us know as soon as possible. >> >> > > >> > Thanks, >> > > >> > Dave > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
