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MathGroup Archive 2006

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Re: finding the position of a pattern in list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64612] Re: [mg64583] finding the position of a pattern in list
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 24 Feb 2006 00:18:08 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

data={0,0,1,1,1,0,0,1,1,1,0};

Position[Partition[data,2,1],{0,1}]//Flatten

{2,7}


Bob Hanlon

> 
> From: Gang Ma <contactmagang at gmail.com>
To: mathgroup at smc.vnet.net
> Subject: [mg64612] [mg64583] finding the position of a pattern in list
> 
> Hi,
> I am working on a program to do the following: My data is a list of 0  
> and 1. For example, {0,0,1,1,1,0,0,1,1,1,0}. I want to find the  
> positions of all the pattern of {0,1}.  In my previous example, the  
> first {0,1} is at 2 and and the second {0,1} appears at 7. I can  
> write a loop to do this, but I have several thousands such lists,   
> the computation will be time consuming using loop.
> 
> My question is whether it is possible to use the pattern match to do  
> this quickly.  If not for the list, do I need to convert the list to  
> string then use some pattern match for string?  Thank you very much.
> 
> regards,
> 
> Gang Ma
> 
>   
> 
> 


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