Position function

*To*: mathgroup at smc.vnet.net*Subject*: [mg55549] Position function*From*: konstantpi at mail15.com*Date*: Tue, 29 Mar 2005 03:42:32 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

suppose i have a List: a={{1,3,1,2,1},{5,6,1,1,3,1}} how i could know the positions of "1" in every sublist , i could use Position[a [[1]],1] and Position[a[[2]],1] but i want a one formula to give me {{1,3,5},{3,4,6}} the second question: using Position[a,1] will give: {{1, 1}, {1, 3}, {1, 5}, {2, 3}, {2, 4}, {2, 6}} in general how to extract only the second item from every sublist so the output will be; {1,3,5,3,4,6} thanks konst.

**Follow-Ups**:**Re: Position function***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: Position function***From:*DrBob <drbob@bigfoot.com>