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RE: sum question

• To: mathgroup at smc.vnet.net
• Subject: [mg91196] RE: [mg91169] sum question
• From: "Jose Luis Gomez" <jose.luis.gomez at itesm.mx>
• Date: Sat, 9 Aug 2008 07:45:00 -0400 (EDT)
• References: <200808081114.HAA11632@smc.vnet.net>

Dear Philip

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

2) Take look at this, it might be useful:
http://homepage.cem.itesm.mx/lgomez/matecmatica/fp/fp.html 

http://homepage.cem.itesm.mx/lgomez/matecmatica/funcionalprog.nb 

Best regards
Jose 
Mexico

-----Mensaje original-----
De: Kopp, Philip F [mailto:philip-kopp at uiowa.edu] 
Enviado el: Viernes, 08 de Agosto de 2008 06:14
Para: mathgroup at smc.vnet.net
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" <philip-kopp@uiowa.edu>