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 >> > Abelian Sandpile Model. 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 -~----------~----~----~----~------~----~------~--~---
