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Re: Infinite Series Error - Bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124559] Re: Infinite Series Error - Bug?
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Wed, 25 Jan 2012 06:59:43 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201201241006.FAA20247@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

NSum[q^(-6 + 4*n)/(1 - q^(-5 + 4*n)) /. {q -> 0.1}, {n, 0, Infinity}]

-21.1012

Bobby

On Tue, 24 Jan 2012 04:06:02 -0600, clashton <clashton at gmail.com> wrote:

> Can anyone explain why evaluating the following expression gives an
> error?
>
> Sum[q^(-6 + 4*n)/(1 - q^(-5 + 4*n)), {n, 0, Infinity}] /. {q -> 0.1}
>
> None of the denominators are 0 (would only happen if -5 + 4*n=0, which
> is impossible for an integer n, yet I get an error message "Infinite
> expression 1/0 encountered" (several times in fact).
>
> Any help on a work around greatly appreciated.
>
> (Please reply to my personal e-mail also).
>
> Thanks,
>
> Jimmy
>


-- 
DrMajorBob at yahoo.com



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