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RE: sum question

  • To: mathgroup at
  • Subject: [mg91196] RE: [mg91169] sum question
  • From: "Jose Luis Gomez" <jose.luis.gomez at>
  • Date: Sat, 9 Aug 2008 07:45:00 -0400 (EDT)
  • References: <>

Dear Philip

1) Post your Mathematica code, so that we can help you

2) Take look at this, it might be useful: 

Best regards

-----Mensaje original-----
De: Kopp, Philip F [mailto:philip-kopp at] 
Enviado el: Viernes, 08 de Agosto de 2008 06:14
Para: mathgroup at
Asunto: [mg91169] sum question

Hi, I am trying to work with a rather large sum(>200 terms)  in Mathematica
, but the program displays some odd behavior.
When I multiply each term in the sum by 1, I get 1 for the answer.  When I
change 1 to 1.0, I get an incredibly large number for the answer.
There seems to be some problem with using decimal numbers in this large sum.
I tried Rationalize[1.0], and it works.  What I am really trying to do is
multiply each term by a different number(all less than one) that I
calculated in another program.  These numbers are in decimal form, so I run
into the same problem.  When I try rationalize here, it doen't fix the
problem.  Any other suggestions?

  • References:
    • sum question
      • From: "Kopp, Philip F" <>
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