Re: how to make conditional summation

*To*: mathgroup at smc.vnet.net*Subject*: [mg55563] Re: [mg55545] how to make conditional summation*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Wed, 30 Mar 2005 03:20:57 -0500 (EST)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

If f[0] is defined Sum[f[m],{m,-N,N}]-f[0] If f[0] is not defined, either Sum[f[m]+f[-m],{m,1,N}] or f[0]=0; Sum[f[m],{m,-N,N}] Bob Hanlon > > From: "Xiao Jun Jun" <xiaoxun at gmail.com> To: mathgroup at smc.vnet.net > Date: 2005/03/29 Tue AM 03:42:29 EST > To: mathgroup at smc.vnet.net > Subject: [mg55563] [mg55545] how to make conditional summation > > Hi, All, > > Say, Sum[f[m],{m,-N,N}] with N != 0 > Any suggestions? > > Regards. > Xun > > > Bob Hanlon Chantilly, VA