Re: Multiple sum excluding some terms
- To: mathgroup at smc.vnet.net
- Subject: [mg44122] Re: Multiple sum excluding some terms
- From: Bill Rowe <readnewscix at mail.earthlink.net>
- Date: Thu, 23 Oct 2003 07:15:32 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 10/22/03 at 3:24 AM, guillerm at aida.usal.es (Guillermo Sanchez) wrote:
> How make a multiple sum (example: Sum[m[i, j], {j, 1, 3}, {i, 1, 2}])
> excluding terms i = j?
Here are a couple of ways to achieve what you want
Sum[(1-KroneckerDelta[i,j]) m[i,j],{j,3}, {i,2}]
or
A = Table[m[i,j],{j,3},{i,2}]
Plus@@Flatten@A-Tr@A
--
To reply via email subtract one hundred and nine