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>
- Re: Position function