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