Re: Multiple sum excluding some terms
- To: mathgroup at smc.vnet.net
- Subject: [mg44112] Re: [mg44089] Multiple sum excluding some terms
- From: Hugh Walker <hwalker at gvtc.com>
- Date: Thu, 23 Oct 2003 07:15:04 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On Wednesday, October 22, 2003, at 02:24 AM, Guillermo Sanchez wrote:
> How make a multiple sum (example: Sum[m[i, j], {j, 1, 3}, {i, 1, 2}])
> excluding terms i = j?
Hello Guillermo:
How about
Sum[m[j,k](1-KroneckerDelta[j,k]),{j,1,3},{k,1,3}]
0r
Sum[m[j,k] If[j==k,0,1],{j,1,3},{k,1,3}]
Regards,
==========
Hugh Walker
Gnarly Oaks