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MathGroup Archive 2005

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Re: Sum

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55225] Re: Sum
  • From: "Peltio" <peltio at trilight.zone>
  • Date: Thu, 17 Mar 2005 03:28:50 -0500 (EST)
  • References: <d192qe$ng4$1@smc.vnet.net>
  • Reply-to: "Peltio" <peltioNOSPAM at despammed.com.invalid>
  • Sender: owner-wri-mathgroup at wolfram.com

"mjumbo" wrote

>x = Exp[-k]
>Sum[x, {k, 0, Infinity}]
>
>don't? What should I do to make it work?

Sum has the attribute HoldAll.
So you need to evaluate the expression x passed to it if yuo want it to see
what's inside it.

    Sum[Evaluate[x], {k, 0, Infinity}]

cheers,
Peltio


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