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MathGroup Archive 2007

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Re: problems with delayed write: tag list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg79903] Re: problems with delayed write: tag list
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Wed, 8 Aug 2007 04:55:12 -0400 (EDT)
  • References: <f991i3$c99$1@smc.vnet.net>

P_ter wrote:
> Hello,
> I have a list of elements of two numbers:myList = {{1,2},{2,7},..}. The first number is in this case always the position. I want to know when the difference is a certain value,myDiff, eg. 5
> i=1;myDiff==5;
> now= Reap[While[i<Length[myList],i++;
>        If[myList[[i,2]]-myList[[i,1]]==myDiff,Sow[i]]];w]
> My question is: how do I make "nowFunction[myDiff_]:="? 
> I run into tag list errors in the definition when I try that.
> P_ter
> 
Perhaps this would be clearer if you either

a) Gave us a few samples of input and the corresponding output

or

b) Supply some complete code that fails.

Note also that on line 1 you have written myDiff==5, where you 
presumably meant myDiff=5 .

David Bailey
http://www.dbaileyconsultancy.co.uk


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