On Feb 10, 11:16 am, Simon King <[email protected]> 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 [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
