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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>