Simple task with Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg63040] Simple task with Mathematica*From*: "Lea Rebanks" <lrebanks at onetelhk.net>*Date*: Sun, 11 Dec 2005 04:57:35 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Dear Sir / Madame, I am currently learning how to use Mathematica at college with a view to purchasing the program. Having spent a week studying the documentation / Book etc of version 4 I am struggling to do even the most simple tasks. I have looked at other Math programs, but I am really impressed with the numerical precision & scope of Mathematica. Below is an example of a really easy task which I can do in a second in Excel, however I am stuck with Mathematica 4. Please show me the correct code to do in Mathematica. Many thanks for your attention. Question:- Given the two columns below; I am trying to take the first column (A) created as a list & iterate it by starting with 5 to finish with the second column using the function A(1) = (6.5*2)-5 (starting value from the second column) = 8. Then, for A(2) = (9.5*2)-8 =11 etc, etc giving the second column. Function A(x) = x*2. (A)rea 5 6.5 8 9.5 11 8.5 6 4.5 3 9 15 12.5 10 12.5 15 17.5 20 18.5 17 11 5 I have tried indexing with x = Range[11] & using A[[x]]-B[[x-1]]. Sorry, but I am really confused. Many thanks for any help you can offer. Best regards, Lea Rebanks.

**Follow-Ups**:**Re: Simple task with Mathematica***From:*Murray Eisenberg <murray@math.umass.edu>