Re: position of sequence of numbers in list

*To*: mathgroup at smc.vnet.net*Subject*: [mg106993] Re: [mg106976] position of sequence of numbers in list*From*: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>*Date*: Sun, 31 Jan 2010 05:55:49 -0500 (EST)*References*: <201001301212.HAA25132@smc.vnet.net>

Hi, I assume the only thing you miss is how to express a "sequence of numbers"? Just use Sequence[] :-) list=Range[20]; Position[list, Sequence[11, 12, 13]] Cheers Patrick On Sat, 2010-01-30 at 07:12 -0500, JB wrote: > 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 >

**References**:**position of sequence of numbers in list***From:*JB <jkerrb@gmail.com>