Mathematica 9 is now available
Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Iterate through a list help

  • To: mathgroup at
  • Subject: [mg77187] Iterate through a list help
  • From: Nick <hoffmannick at>
  • Date: Tue, 5 Jun 2007 06:48:49 -0400 (EDT)

Hello! I'm (somewhat) new to Mathematica and I  need help to iterating
through a list and counting the occurrence of a number.

My list looks like:


The number that I would need to keep track of is the first in each

So for the first couple {{1,0},{1,1},{2,x+x^2+x^4},{2,1+x+x^2+x^4},

I would need to keep track of 1,1,2,2,4........

It will not always be 1,2,4,5,8's.  The numbers may be completely
different on each pass.  Each sublist may be composed of more items
but the number that I need to keep track of will always be the 1st in
the sub-list.  Any help or suggestions that you can give me will be
greatly appreciated.  Thanks so much!

  • Prev by Date: links
  • Next by Date: Re: Linear algebra and machine precision
  • Previous by thread: links
  • Next by thread: Re: Iterate through a list help