We still haven't updated SymPy Live to SymPy 1.0, so the output of
some examples may be different.

Aaron Meurer

On Thu, Apr 28, 2016 at 8:40 AM, Peter Luschny <[email protected]> wrote:
> http://docs.sympy.org/latest/modules/functions/combinatorial.html#risingfactorial
>
> I executed the examples in SymPy-Live but got different
> outputs from what the docs say. For example for
>
>>>> rf(x, k).rewrite(ff)
> gives  nothing  instead of: FallingFactorial(k + x - 1, k)
>
>>>> rf(x, k).rewrite(binomial)
> gives  (x)^(k)  instead of: binomial(k + x - 1, k)*factorial(k)
>
>>>> rf(n, k).rewrite(factorial)
> gives  (n)^(k)  instead of: factorial(k + n - 1)/factorial(n - 1)
>
> Also for rf(x**3, 2) the output is different, not
> Poly(x**6 + 3*x**5 + 3*x**4 + x**3, x, domain='ZZ')
>
> Peter
>
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