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MathGroup Archive 2007

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Re: Selecting Sub-lists After Split

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77460] Re: Selecting Sub-lists After Split
  • From: Donald DuBois <donabc at comcast.net>
  • Date: Sat, 9 Jun 2007 05:35:03 -0400 (EDT)

> 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 
> 

Select[myNewList, Negative[First[#]] &]
should accomplish it.
Regards,
Don


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