[sage-combinat-devel] Re: Robinson-Schensted bug
Located the error: in permutation.py, lines 3758 and 3766, bisect should be replaced by bisect_left, as follows: from bisect import bisect_left permutation = [] d = dict((qij,i) for i,Li in enumerate(q) for qij in Li) p = map(list, p) for i in reversed(d.values()): x = p[i].pop() for row in reversed(p[:i]): y = bisect_left(row,x) - 1 x, row[y] = row[y], x permutation.append(x) return Permutation(reversed(permutation)) Le lundi 21 janvier 2013 08:23:57 UTC+1, Jean-Yves Thibon a écrit : > > robinson_schensted_inverse returns wrong output: > > > from sage.combinat.permutation import robinson_schensted_inverse > sage: u > [[1, 1, 1], [2, 2], [3]] > sage: t > [[1, 3, 4], [2, 6], [5]] > sage: w = robinson_schensted_inverse(u,t) > sage: w > [3, 1, 1, 2, 2, 1] > sage: w.robinson_schensted() > [[[1, 1, 1, 2], [2], [3]], [[1, 3, 4, 5], [2], [6]]] > > -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To view this discussion on the web visit https://groups.google.com/d/msg/sage-combinat-devel/-/54Kii19Cd9AJ. 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: Robinson-Schensted bug
Hey Jean-Yves, If you want to write a small patch to fix this to get something merged into sage, please let me know because I might need to rebase trac_8392-check_permutation-ts.patch (I can also review it). Otherwise I can work the fix in my aforementioned patch because I'm reworking the RSK interface (turns out I've unintentionally had the fix for this, although it's not yet in Permutation_class.robinson_schensted() :-P ). Thanks, Travis On Monday, January 21, 2013 10:14:32 AM UTC-8, Jean-Yves Thibon wrote: > > Located the error: in permutation.py, lines 3758 and 3766, > bisect should be replaced by bisect_left, as follows: > > from bisect import bisect_left > > permutation = [] > d = dict((qij,i) for i,Li in enumerate(q) for qij in Li) > p = map(list, p) > for i in reversed(d.values()): > x = p[i].pop() > for row in reversed(p[:i]): > y = bisect_left(row,x) - 1 > x, row[y] = row[y], x > permutation.append(x) > return Permutation(reversed(permutation)) > > > > > > > Le lundi 21 janvier 2013 08:23:57 UTC+1, Jean-Yves Thibon a écrit : >> >> robinson_schensted_inverse returns wrong output: >> >> >> from sage.combinat.permutation import robinson_schensted_inverse >> sage: u >> [[1, 1, 1], [2, 2], [3]] >> sage: t >> [[1, 3, 4], [2, 6], [5]] >> sage: w = robinson_schensted_inverse(u,t) >> sage: w >> [3, 1, 1, 2, 2, 1] >> sage: w.robinson_schensted() >> [[[1, 1, 1, 2], [2], [3]], [[1, 3, 4, 5], [2], [6]]] >> >> -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To view this discussion on the web visit https://groups.google.com/d/msg/sage-combinat-devel/-/VkNIB8Vmxc4J. 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: Robinson-Schensted bug
> > (turns out I've unintentionally had the fix for this, although it's not > yet in Permutation_class.robinson_schensted() :-P ). Scratch that last bit, this would be in the robinson_schensted_inverse(). -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To view this discussion on the web visit https://groups.google.com/d/msg/sage-combinat-devel/-/nF6zodyBKKAJ. 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: Robinson-Schensted bug
Hi Travis, if you can fix it, that's fine for me. Thanks, Jean-Yves Le mardi 22 janvier 2013 04:15:16 UTC+1, Travis Scrimshaw a écrit : > > (turns out I've unintentionally had the fix for this, although it's not >> yet in Permutation_class.robinson_schensted() :-P ). > > > Scratch that last bit, this would be in the robinson_schensted_inverse(). > -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To view this discussion on the web visit https://groups.google.com/d/msg/sage-combinat-devel/-/rg7TLmQwTlYJ. 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.
