Re: Sum
- To: mathgroup at smc.vnet.net
- Subject: [mg55227] Re: [mg55175] Sum
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Thu, 17 Mar 2005 03:28:54 -0500 (EST)
- References: <200503161035.FAA23742@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Mar 16, 2005, at 5:35 AM, mjumbo wrote:
> Can sombody explain me why
>
> Sum[Exp[- k], {k, 0, Infinity}]
>
> gives the correct result, while the following (imho equivalent)
> statements
>
> x = Exp[-k]
> Sum[x, {k, 0, Infinity}]
>
> don't? What should I do to make it work? It is rather vexing to
> copy/paste long expressions instead of using short placeholders like
> x.
Sum evaluates its arguments in a nonstandard way,
Sum[Evaluate[x],{k,0,Infinity}]
works.
Regards,
Ssezi
- References:
- Sum
- From: mjumbo <mjumbo@nm.ru>
- Sum