Re: finding the position of a pattern in list

*To*: mathgroup at smc.vnet.net*Subject*: [mg64626] Re: [mg64583] finding the position of a pattern in list*From*: János <janos.lobb at yale.edu>*Date*: Fri, 24 Feb 2006 00:18:29 -0500 (EST)*References*: <200602230534.AAA13180@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On Feb 23, 2006, at 12:34 AM, Gang Ma wrote: > 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 > > Here is a newbie approach: In[2]:= Position[Partition[lst, 2, 1], {0, 1}] Out[2]= {{2}, {7}} János ---------------------------------------------- Trying to argue with a politician is like lifting up the head of a corpse. (S. Lem: His Master Voice)

**References**:**finding the position of a pattern in list***From:*Gang Ma <contactmagang@gmail.com>