On Fri, Sep 5, 2014 at 5:48 PM, Viviane Pons <vivianep...@gmail.com> wrote: > The Permutation0 might be a good idea, I don't know... It wouldn't change > the tuple vs. list thing which is used to distinguish between the cycle > notation and the word notation. > > I agree some of the syntax could be improved. But I do think backward > compatibility is important. It's really annoying when you have to rewrite
Agreed. I quit Maple years and years ago because of this. An optional parameter can solve all this, IMHO. > ALL your old personal code when you update your sage version (which happens > all the time), and I know it's a put-off for many people (and Sage has quite > a bad reputation for it). > > Also, Nathann, please do not assume that you represent all the Sage coders. > I'm a Sage coder and user, and I use 1-Permutation. I use them ALL THE TIME > and I need them. In every single of my programs, because permutation is my > main object of study! And the users you seem to so easily ignore are > contributors too. They contribute to algorithms and maps on permutations > that are useful to everyone. The fact is that in the math world, in every > single paper about the symmetric group, the permutations are 1-Permutations > and it makes sense to have them. > > As Volker says, it's an old debate and you can't just erase everyone else's > work and point of views because it suits you. The fact that it makes you > lose time is bad and yes, we have to do something about it. But there is no > simple answer and people are making efforts to handle all these different > situations as best as they could. > > Cheers > > Viviane > > > 2014-09-05 22:16 GMT+02:00 Volker Braun <vbraun.n...@gmail.com>: >> >> The whole 0 vs. 1 based permutations (Python vs. Matlab :-) is always >> confusing. And there is good reason and history in both conventions, so we >> should IMHO accept that we'll have to live with it. Its not something that >> can be solved satisfactorily by trying to guess the user's intentions, you >> can never say for sure if thats a 0-based permutation that just doesn't act >> on 0. >> >> So how about making it explicit, have separate Permutation and >> Permutation0 (instead of tuple vs list). They can share most of the backend, >> its just a slightly different set that they operate on. In Code, you just >> call sigma = Permutation0(sigma) on user input in the beginning to convert >> it to your desired presentation if you depend on the actual integers. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "sage-devel" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sage-devel+unsubscr...@googlegroups.com. >> To post to this group, send email to sage-devel@googlegroups.com. >> Visit this group at http://groups.google.com/group/sage-devel. >> For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
