On Thu, Sep 18, 2008 at 9:49 AM, John Cremona <[EMAIL PROTECTED]> wrote: > > This looks a bit like an additive version of what we already do with > factorizations. I wonder if you could clever use the factorization > class for it?
It's possible somebody might find this useful: sage: FormalSum([(1,1/4),(1,-1/5)]) -1/5 + 1/4 > > John > > PS I didn't really mean to suggest that you were stuck on the > mathematics of this! > > 2008/9/18 John H Palmieri <[EMAIL PROTECTED]>: >> >> On Sep 18, 7:41 am, John H Palmieri <[EMAIL PROTECTED]> wrote: >>> >>> It wasn't the mathematics I was looking for, but how to output the >>> answer once I find it. If Sage computes that 1/20 = 1/4 - 1/5, how do >>> I get it to print the expression 1/4 - 1/5 without simplifying it to >>> 1/20? For example, if I compute the various parts and store them in a >>> list 'parts', then something naive like 'return sum(parts)' won't >>> work. How do I return an expression made up of rational numbers, +'s, >>> and -'s, with no simplification? >> >> One answer to my own question: I can define a new class whose >> instances are rational numbers, but whose repr and latex methods are >> in terms of their partial fraction decomposition. Is there a better >> way to do this? >> >> John >> > >> > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
