Unfortunately, the example is just a basic case of the functionality I'd want to use - I need a reliable way of sorting symbolic values like that. Other software I've tried struggles with this a lot, so I thought SymPy would work better - unfortunately not! Thank you for your reply anyway.
On Wednesday, 16 October 2013 00:45:38 UTC+1, Aaron Meurer wrote: > > I think the logic you want isn't implemented. Right now, the > assumptions module doesn't really do anything with interval type > assumptions, like 0 < x < 1. It only knows about assumptions like > positive or negative. > > Of course, if all you want to do is sort symbols by their exponent, > that is not too difficult to do, especially if you know for sure that > each element of your list is a power of that symbol. You just need to > define an appropriate key function and use it when sorting. > > Aaron Meurer > > On Tue, Oct 15, 2013 at 3:47 PM, BR <[email protected] <javascript:>> > wrote: > > Hey, > > > > I've been trying to find some information online on SymPy's assumptions > > module and unfortunately I can't find an answer to my question. Is it > > possible to declare symbols with assumptions in such a way that they are > > respected when sorting them? For instance, is it possible to declare a > > symbol x with the assumption that 0<x<1, so that sorting [w, w**2, w**3] > > gives [w**3, w**2, w]? > > > > Thanks. > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to [email protected] <javascript:>. > > To post to this group, send email to [email protected]<javascript:>. > > > Visit this group at http://groups.google.com/group/sympy. > > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
