I am attempting to rsolve a recursion and am having a problem. Doctoring
up the first example the live window follows. Please note that I changed (n**2
+ 3*n - 2) to (n**2 + 3*n - k) and then no output results. Is this because
it won't handle parameters or am I supposed to do things differently?
Ray
Python console for SymPy 0.7.6 (Python 2.7.5) These commands were executed:
>>> from __future__ import division >>> from sympy import * >>> x, y, z, t
= symbols('x y z t') >>> k, m, n = symbols('k m n', integer=True) >>> f, g,
h = symbols('f g h', cls=Function)
>>> from sympy import Function, rsolve
>>> f = (n - 1)*y(n + 2) - (n**2 + 3*n - 2)*y(n + 1) + 2*n*(n + 1)*y(n)
>>> rsolve(f, y(n))
2nC0+C1n!
>>> from sympy import Function, rsolve
>>> from sympy.abc import n
>>> from sympy.abc import n
>>> y = Function('y')
>>> y = Function('y')
>>> f = (n - 1)*y(n + 2) - (n**2 + 3*n - 2)*y(n + 1) + 2*n*(n + 1)*y(n)
>>> rsolve(f, y(n))
2nC0+C1n!
>>> f = (n - 1)*y(n + 2) - (n**2 + 3*n - k)*y(n + 1) + 2*n*(n + 1)*y(n)
>>> rsolve(f, y(n))
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