On 11/28/12 5:35 AM, Dima Pasechnik wrote: > On 2012-11-27, Travis Scrimshaw <tsc...@ucdavis.edu> wrote: >> ------=_Part_468_5000489.1354057101700 >> Content-Type: text/plain; charset=ISO-8859-1 >> >> Hey everyone, >> I've been trying to figure out how to handle generalized >> permutations (a.k.a. two-line arrays, bi-words, ...) since we want >> Permutation() to only accept input from 1 to n. > A typical misuse of Permutation is in > sage/combinat/integer_vector_weighted.py > where nothing prevents one to return lists all the time. > Cf. e.g. the relevant part of > http://trac.sagemath.org/sage_trac/attachment/ticket/13742/trac_13742_reviewer1.patch > Yes, and the RSK stuff is a more tricky one. > > I have a stupid question: why can't one just use lists? > One should not overdesign. What are the real > reasons for GeneralizedPermutation to come? > E.g. to have a special class to just handle a pair of lists of > equal length is a big an overdesign to me. > And if you need the first list to be ordered, use a pair (set,list)
Hi Dima, This last suggestion would indeed be a good idea. Where would you put the code in this case? The input would be a (set,list) and the output a pair of semistandard Young tableaux, so it is not so obvious where it belongs. Best, Anne -- 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.
