On Wed, Feb 10, 2010 at 8:50 AM, Walking Randomly <michael.p.crouc...@googlemail.com> wrote: > Regarding namespace pollution. Mathematica has thousands of function > names in it's global namespace but it never causes programmers a > problem because they have a convention. All mathematica functions > start with a capital: Integrate, Plot, ListPlot etc. So, stick to > lower case variables and you don't need to worry about a thing. Could > SAGE not follow a similar convention?
Python has naming conventions, which Sage follows: http://www.python.org/doc/essays/styleguide.html > > Cheers, > Mike > > On Feb 10, 12:42 pm, Harald Schilly <harald.schi...@gmail.com> wrote: >> On Feb 10, 11:16 am, Simon King <simon.k...@nuigalway.ie> wrote: >> >> > sage: f = y(n+2) - y(n+1) - y(n) >> >> ahh ... ok. now i get it ^^ >> When I look into sympy/solvers/recurr.py right the first thing rsolve >> does is to compute lhs - rhs. So, f = y(n) == y(n-1) - y(n-2) *should* >> work. But it doesn't, because that equation doesn't get transformed >> into a sympy Equality (just a "bool"). >> >> This works: >> >> sage: f = Equality(y(n), y(n-1) + y(n-2)) >> sage: rsolve(f, y(n)) >> C0*(1/2 + 5**(1/2)/2)**n + C1*(1/2 - 5**(1/2)/2)**n >> >> I'm +1 for introducing rsolve in sage (and yes, more namespace >> pollution, but we have to think about all the newcomers who expect >> some easy functions to work just out of the box, integrate, diff, >> etc...) >> >> H > > -- > To post to this group, send email to sage-support@googlegroups.com > To unsubscribe from this group, send email to > sage-support+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-support > URL: http://www.sagemath.org > -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
