[R] sum to infinity

[tuggi]

hello,

can i calculate a sum to infinity in R.
i want to do something like this:

\sum_{i=0}^\infty
\frac{2^{-d-1}}{\Gamma(\frac{d-1}{2})}\left(\frac{\Gamma(2d-3)(2-d)_{i}\Gamma(i+1,-z/2)2^{i+1}}{\Gamma(d-1)(4-2d)_{i}i!}\right)+
\\
\sum_{i=0}^\infty
\frac{2^{-d-1}}{\Gamma(\frac{d-1}{2})}\left(\frac{\Gamma(3-2d)(d-1)_{i}\Gamma(2d-2+i,-z/2)2^{2d-2+i}}{\Gamma(2-d)(2d-2)_{i}}\right),

where (a)_{i}=\Gamma(a+i) / \Gamma(a) .
I hope someone can help me.

Tuggi
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