On Wed, Sep 14, 2011 at 3:04 PM, David Joyner <wdjoy...@gmail.com> wrote: > On Wed, Sep 14, 2011 at 5:48 PM, Aaron Meurer <asmeu...@gmail.com> wrote: >> What actually needs to be done? > > Well, basically just get a Sage trac account (I think just email > sage-trac-account https://groups.google.com/group/sage-trac-account for that), > click on the trac ticket and click positive review:-) To actually to the > review > correctly, see the appropriate sections of the developer's manual > http://www.sagemath.org/doc/developer/ (for example I like > http://www.sagemath.org/doc/developer/producing_patches.html > to apply patches). > > >> >> On Wed, Sep 14, 2011 at 3:31 PM, David Joyner <wdjoy...@gmail.com> wrote: >>> Hi all: >>> >>> Just a little reminder: there is a trac item in Sage detailing with >>> the upgrade of >>> Sympy to 0.7.1 (from 0.6.4). I think almost anyone on this email list with >>> sufficient interest could do this review: >>> http://trac.sagemath.org/sage_trac/ticket/11560. >>> It would be great if someone could find the time to do this. >>> I have agree to write a review of a CAS for a December publication, >>> and resolving this ticket would help a lot for examples I could give >>> that mention Sympy. (I am thinking now it would possibly be on Sage >>> but mention Sympy in some examples.) >>> >>> I'd also like to say that, thanks to the improvements to the >>> Sympy 0.7.1 modules for dsolve (mostly due to Aaron Meurer), >>> some DEs are solved by Sympy better than by Maxima - >>> very useful for my day-to-day teaching! >> >> I wrote the initial ODE module, which was first included in 0.6.6, but >> not much has changed since then. But I guess the most recent Sage >> version is 0.6.4. Anyway, I haven't really done much work on it since >> then :) >> >> I did notice at the time, though, that it was more powerful that >> Maxima (or any other open source CAS that I knew of). For example, no >> other open source system (or at least not Maxima) to my memory >> bothered to implement the general nth order case for variation of >> parameters. Also, I don't think things like first order ODEs with >> homogeneous coefficients are implemented in Maxima, if I remember >> correctly. >> >> Anyway, I'm glad to hear that it's been useful to you. >> >> By the way, do you find the hint manager useful for teaching? That > > > Yes, it is. Sadly, it is not in Sage yet though... > > >> was one of the motivations of implementing it, that it would be easy >> to teach, e.g., the Bernoulli method and call dsolve(ode, f(x), >> 'Bernoulli') or dsolve(ode, f(x), 'Bernoulli_Integral'), and it would >> be very instructive, as the output would look exactly like it would if >> you used that method by hand (especially the Integral output). > > > Agreed. And, thanks very much for your hard work on improving > this!
David, is this the course that you are teaching from: http://www.usna.edu/Users/math/wdj/teach/sm212/ ? We should put some of the examples into sympy documentation, so far we have this: http://docs.sympy.org/0.7.1/modules/solvers/ode.html but actually doing examples from an ODE course would be cool. For example for the variation of parameters, I remember it was really tedious to do by hand. It'd be cool to add couple more examples, besides what we have here: http://docs.sympy.org/0.7.1/modules/solvers/ode.html#nth-linear-constant-coeff-variation-of-parameters Ondrej -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
