William Stein wrote: > On Wed, Jul 22, 2009 at 9:31 AM, Golam Mortuza > Hossain<gmhoss...@gmail.com> wrote: >> Hi, >> >> On Wed, Jul 22, 2009 at 7:47 AM, Burcin Erocal<bur...@erocal.org> wrote: >> >>>>> Inability to substitute the argument of D[] has ensured that >>>>> I am forced out from using new sage symbolics for my own work. >>> As I said above, you could have added a short term workaround for this, >>> once you start using cython to call pynac internals. >> As someone said, talk is cheap. FYI, I spent two full days trying to >> find a work-around that really works. May be I did stupid way but I would >> like to invite you to substitute f(x^2)=1 in the following simple expression >> by using any sage algorithm >> >> --------- >> h = f(x^2).diff(x)*(x+1/x) >> >> sage: h.subs(f(x^2)==1) >> 2*(x + 1/x)*x*D[0](f)(x^2) >> >> sage: h.subs(f(x^2).diff(x)==0) >> 2*(x + 1/x)*x*D[0](f)(x^2) >> --------- >> >>> I believe the effort could be better spent fixing the bugs you listed >>> above. >> Thanks for letting know your "belief". If Sage development is dictated >> by someone's belief rather than user's need, then I really shouldn't >> argue anymore. > > No worries. This will get sorted out. Burcin is sharing his opinion, > but it isn't the law or anything, and Sage development is not done by > "dictators". > > I would like to hear more from other users if anybody else has an opinion. >
I think the D notation will not be very helpful in education. My students (in the past) experienced severe problems using this in Maple. Jaap > -- William > > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
