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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: [mg64613] Re: finding the position of a pattern in list
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 24 Feb 2006 00:18:08 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <dtjjcv$de7$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

lst = {0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0};

Position[Partition[lst, 2, 1], {0, 1}]

no loop, no pattern matching

Regards

  Jens



"Gang Ma" <contactmagang at gmail.com> schrieb im 
Newsbeitrag news:dtjjcv$de7$1 at smc.vnet.net...
| 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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