Re: sum question

*To*: mathgroup at smc.vnet.net*Subject*: [mg91242] Re: sum question*From*: David Bailey <dave at Remove_Thisdbailey.co.uk>*Date*: Mon, 11 Aug 2008 06:06:17 -0400 (EDT)*References*: <g7h9q1$bbd$1@smc.vnet.net>

Kopp, Philip F wrote: > 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? > I think you will have to post some actual code in order to obtain a useful reply. David Bailey http://www.dbaileyconsultancy.co.uk