Hey Andrew and Jean-Yves,
> Looking at the patch queue, robinson_schensted_inverse was depreciated in > trac8392 <http://trac.sagemath.org/attachment/ticket/8392>. It seems to > have been replaced with RSK_inverse which just seems wrong to me: with > tab-completion I don't see the need for random acronyms, even relatively > common ones like this one. (This probably just reflects my own > idiosyncrasies:) > There is also robinson_schensted_knuth[_inverse] methods in the global namespace with #15142 <http://trac.sagemath.org/ticket/15142>. And to get an output as a word, use the output='word' option. Note that the output will be an honest word object, not a permutation since non-standard permutations can break some of Permutations methods. If it is indeed a standard permutation, you can use output='permutation'. > Well, I have changed "descents" to "standard_descents", but I still have > problems > with the next two lines of my file. I use robinson_schensted_inverse. I see > that it is deprecated (and certainly it should be, it did not even return > a correct result > one year ago and I had to patch it). So, deprecated, OK, but it still > exists, > and returns a different type now. Instead of a word (as it should be) it > returns > a list of two lists. This is bad. I can easily replace w by w[1]. But this > is still not a word, and my function had to compute its descent > composition. > So it fails. I replace w by Word(w[1]). It fails again, as words do not > have anymore > a descents_composition ... So it is now > Word(w[1]).standard_permutation().descents_composition(), > and so on ... > > I see two possibilities to simplify this. The first is we add a descents_composition() method to words which just calls self.standard_permutation().descents_composition() (or perhaps its own optimized computation). The second would be to give RSK_inverse a checkargument which only checks for standardness if True and passes it to permutation if ouput='permutation'. I'm in favor of the former. Best, Travis -- 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/groups/opt_out.
