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NSum bug or am I doing something wrong?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg93869] NSum bug or am I doing something wrong?
  • From: "Ebpr Preb" <ebpr08 at gmail.com>
  • Date: Thu, 27 Nov 2008 05:33:00 -0500 (EST)

Hi,

I'm getting imaginary answers for simple NSums of rational numbers. The
example below produces the issue in Mathematica 7:

NSum[(-1)^(k + 1)*(.2)^k, {k, 1, 32}]

gives me the result:

0.166667 + 1.1972*10^-44 I

When I switch to Sum the problem disappears.

Any hint?

Thanks so much.

ebpr



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