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/~mhampton/glpk.p0.spkg > > 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 email to sage-devel@googlegroups.com To unsubscribe from this group, send 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 -~----------~----~----~----~------~----~------~--~---
