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