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Position of element in a list

• To: mathgroup at smc.vnet.net
• Subject: [mg16301] Position of element in a list
• From: Roger Mason <rmason at sparky2.esd.mun.ca>
• Date: Sun, 7 Mar 1999 01:05:34 -0500
• Sender: owner-wri-mathgroup at wolfram.com

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

• Follow-Ups:
  • Re: Position of element in a list
    • From: Jurgen Tischer <jtischer@col2.telecom.com.co>
  • Re: Position of element in a list
    • From: "Martin W. Mak" <mwmak@ix.netcom.com>