Re: Position of element in a list
- To: mathgroup at smc.vnet.net
- Subject: [mg16363] Re: Position of element in a list
- From: "Atul Sharma" <mdsa at musica.mcgill.ca>
- Date: Thu, 11 Mar 1999 02:16:39 -0500
- References: <7bt665$ndn@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Try this:
Position[{-1, 3, -2, 1}, _?Negative]
Out: {{1},{3}}
I believe it accomplishes what you asked.
A. Sharma
Roger Mason wrote in message <7bt665$ndn at smc.vnet.net>...
>Hi,
>
>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?
>
>Thanks,
>
>Roger Mason
>
>