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