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