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MathGroup Archive 2007

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Re: Iterate through a list help

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77254] Re: Iterate through a list help
  • From: dimitris <dimmechan at yahoo.com>
  • Date: Wed, 6 Jun 2007 06:58:21 -0400 (EDT)
  • References: <f43gfu$2cq$1@smc.vnet.net>

Again a recent thread begun by a similar question of you!
I guess there were some confusion during the difficult work
of the moderator or otherwise I don't understand what is happening!

[Yes, it is possible that with so many posts that a message was
 duplicated.  It is hard to remember something posted a few hundred
 mwssages ago.  It am thinking about a way to avoid this - moderator]

Dimitris



 /  Nick       :
> 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:
>
> {{1,0},{1,1},{2,x+x^2+x^4},{2,1+x+x^2+x^4},{4,x+x^2},{4,1+x+x^2},{4,x
> +x^4},{4,1+x+x^4},
> {4,x^2+x^4},{4,1+x^2+x^4},{4,x^3+x^4},{4,1+x^3+x^4},{4,x+x^2+x^3+x^4},
> {4,1+x+x^2+x^3+x^4},
> {5,x+x^3},{5,1+x+x^3},{5,x^2+x^3},{5,1+x^2+x^3},{5,x+x^3+x^4},{5,1+x
> +x^3+x^4},{5,x^2+x^3+x^4},
> {5,1+x^2+x^3+x^4},{8,x},{8,x^2},{8,x^3},{8,x^4},{8,1+x},{8,1+x^2},
> {8,1+x^3},{8,x+x^2+x^3},{8,1+x+x^2+x^3},{8,1+x^4}}
>
> The number that I would need to keep track of is the first in each
> sub-
> list.
>
> So for the first couple {{1,0},{1,1},{2,x+x^2+x^4},{2,1+x+x^2+x^4},
> {4,x
> +x^2},........
>
> 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!



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