Re: [sage-combinat-devel] Re: redesign combinatorial statistics
Just to clarify, i wasn't thinking on sage sending a query to findstat, but performing the search locally (i.e. having findstat software included in Sage). I don't know how findstat is implemented, so i don't know how wise that aproach would be. Does findstat relly on a big database that is enhanced with the new queries? Or does it compute every query from scratch? El miércoles, 28 de mayo de 2014 10:01:07 UTC+2, Nathann Cohen escribió: > > > Would it be possible to include the findstat functionality in sage? > > It is possible to write the code, and desirable. As the Sage is > open-source, you are also welcome to give it a try if you need the feature. > Sage already queries the OEIS, though for FindStat you will probably have > to design some kind of protocol to transfer the combinatorial objects with > the website's owners. I am told that you can contact them at > in...@findstat.org . > > Nathann > -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
[sage-combinat-devel] Re: redesign combinatorial statistics
A slightly unrelated problem: Would it be possible to include the findstat functionality in sage? That is, i have a bunch of pairs (permutation, number), then call the function findtsta on them, and get a list of possible ways that the numbers can me computed from the permutations. All inside sage, without need to go to the findstat webpage. -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
[sage-combinat-devel] Re: How to solve this combinatorial problem in Sage?
Maybe i am saying something stupid (i am used to geometric reasoning in infinite fields, so maybe i am missing something important in this setting) but, wouldn't a random linear combination of the rows of your matrix have a high probability of having all the entries different from zero? The linear combinations that have some zero coefficient are the intersections of the corresponding subspace with the coordinate hyperplanes. That is, the set of "bad" linear combinations is a subset of codimension 1. The generic elements of the subspace would not belong to it. -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
[sage-combinat-devel] help wanted with braid groups
I have been working on an implementation of braid groups for sage (together with free and finitely presented groups). So far i have a preliminary version (see ticket #12339). It is still not feature complete and also very slow compared to cbraid[1], for example, but it is usable. In order to speed it up, i want to interface cbraid directly. But i have no experience at all with c++ or python interfaces to external libraries. Please can someone help me with it? For example, i would need to write a function that takes an integer n and a list of integers l (that represents a braid of n strands), and uses cbraid to compute the left normal form. I have tried to do it directly with ctypes, but i only got error messages. Thanks in advance. [1]http://code.google.com/p/cbraid/ -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
[sage-combinat-devel] trac 12339, please review
I have a first version of an implementation of free groups, finitely presented groups and braid groups. For the moment there is a partial list of the fatures: -operation in free groups, finitely presented groups and braid groups through gap. -some gap functions are wrapped, such as abelian invariants, size, and recover the symetric representation of a fp group (not that these two operations may not end) -Burau and Lawrence-Krammer-Bigelow representations of braids -2d and 3d plotting of braids -left normal form of braids please share your thoughts. -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
[sage-combinat-devel] Re: [sage-devel] Free groups, feedback wanted.
I have updated ticket 12339. It now includes a basic implementation of free groups and finitely presented groups. It has limited functionality, and maybe not the best implementation, but it works. Please test it and do any comments that you consider relevant. -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
[sage-combinat-devel] Re: [sage-devel] Free groups, feedback wanted.
I have updated ticket #12339. It includes a basic implementation of free groups and finitely presented groups. It has limited features, and maybe its not the best implementation possible, but it works. Please test it and do any relevant comments. -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
