Re: Multiple Sums in Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg53748] Re: Multiple Sums in Mathematica
- From: Roland Franzius <roland.franzius at uos.de>
- Date: Wed, 26 Jan 2005 04:36:28 -0500 (EST)
- Organization: Universitaet Hannover
- References: <csvir2$avi$1@smc.vnet.net> <ct55mf$e62$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Roland Franzius wrote:
> Sebastian Brandt wrote:
>
>>Hello,
>>
>>I want to perform a nested sum, where the number of summations is not
>>specified. I.e., I am looking for a way to implement the sum
>>
>>sum[ f, {i1, 1, M}, {i2, 1, M}, ..., {in, 1, M} ]
>>
>>Does anbody know how to do this for arbitrary n?
>
>
> s[n_] := sum[f, Sequence[
> ToExpression["{i" <> # <> ",1,M}" & /@ (ToString /@ Range[n])]]]
>
Sorry error, must be
s[n_] := sum[f, Sequence @@ ToExpression["{i" <> # <> ",
1,M}" & /@ (ToString /@ Range[n])]]
--
Roland Franzius