Re: Multiple Sums in Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg53713] Re: Multiple Sums in Mathematica
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Mon, 24 Jan 2005 03:37:39 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
On 1/23/05 at 2:02 AM, sbrandt at physics.wustl.edu (Sebastian Brandt)
wrote:
>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?
Put the iterators in a list and use Sequence. For example,
list = {{n, 1, 4}, {m, 2, 5}};
Sum[n + m, Evaluate[Sequence@@list]]
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