Re: how to make conditional summation
- To: mathgroup at smc.vnet.net
- Subject: [mg55593] Re: how to make conditional summation
- From: D Herring <dherring at at.uiuc.dot.edu>
- Date: Wed, 30 Mar 2005 03:22:30 -0500 (EST)
- References: <d2b4ki$76i$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi Xun,
> Say, Sum[f[m],{m,-N,N}] with N != 0
> Any suggestions?
Maybe something like
Sum[If[m==0,0,f[m]], {m,-N,N}]
?
For example,
Sum[If[m==0, 0, 1/m^2], {m, -100, 100}]
would ordinarily fail at m==0.
Later,
Daniel