MathGroup Archive 2007

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

Search the Archive

Re: Selecting Sub-lists After Split


On Jun 8, 2007, at 5:34 AM, Gregory Lypny wrote:

> Hello everyone,
>
> Suppose I have a list of real number called myList.  I split it into
> sub-lists of positive and negative numbers called myNewList by doing
> this (there may be a more elegant way):
>
> myNewList = Split[myList, #1 #2 > 0 &]
>
> Now, how can I select all of the sub-lists of negative numbers from
> myNewList?
>
> Any tips would be most appreciated.
>
> Regards,
>
> 	Gregory


Here is a newbie approach:

First[Last[Reap[i = 1; While[i <= Length[newlst],
       If[First[newlst[[i]]] < 0, Sow[newlst[[i]]], Null]*
         i++; ]]]]

newlst is your MyNewList.

J=E1nos


========================
"I think I may need a bathroom break? Is this possible?" --G.W.Bush
http://news.bbc.co.uk/2/hi/americas/4249646.stm




  • Prev by Date: Re: Export data in Mathematica 6 in TSV format
  • Next by Date: Re-defining Log over it's branch cut
  • Previous by thread: Selecting Sub-lists After Split
  • Next by thread: Re: Selecting Sub-lists After Split