position of sequence of numbers in list

*To*: mathgroup at smc.vnet.net*Subject*: [mg106976] position of sequence of numbers in list*From*: JB <jkerrb at gmail.com>*Date*: Sat, 30 Jan 2010 07:12:04 -0500 (EST)

Hi, What is the most efficient way to find the position of the beginning of a sequence of numbers from a list? I found a couple of ways: find 3,4 in list={1,2,3,4,5}; 1. pos=Intersection[Position[list,3],(Position[list,4])+1] 2. pos=Position[Partition[list,2,1],{3,4}] Are there other ways to do this? What is the best way when dealing with large lists? Thanks, JB

**Follow-Ups**:**Re: Re: position of sequence of numbers in list***From:*Leonid Shifrin <lshifr@gmail.com>

**Re: position of sequence of numbers in list***From:*Leonid Shifrin <lshifr@gmail.com>

**Re: position of sequence of numbers in list***From:*Leonid Shifrin <lshifr@gmail.com>

**Re: position of sequence of numbers in list***From:*Leonid Shifrin <lshifr@gmail.com>

**Re: position of sequence of numbers in list***From:*DrMajorBob <btreat1@austin.rr.com>

**Re: position of sequence of numbers in list***From:*Patrick Scheibe <pscheibe@trm.uni-leipzig.de>