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MathGroup Archive 2005

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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


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