Re: Position of element in a list
- To: mathgroup at smc.vnet.net
- Subject: [mg16351] Re: [mg16301] Position of element in a list
- From: BobHanlon at aol.com
- Date: Thu, 11 Mar 1999 02:16:33 -0500
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 3/7/99 7:48:00 AM, rmason at sparky2.esd.mun.ca writes:
>I want to find the Position[] of negative elements in a list. The obvious
>methods do not work:
>
>Position[{-1, 3, -2, 1}, -_]
>
>and
>
>Position[{-1, 3, -2, 1}, -x_]
>
>return
>
>{}
>
>So how do I perform this apparently simple task?
>
Position[{-1, 3, -2, 1}, _?Negative]
Bob Hanlon