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Re: Position of element in a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16359] Re: Position of element in a list
  • From: dreiss at !SPAMscientificarts.com (David Reiss)
  • Date: Thu, 11 Mar 1999 02:16:37 -0500
  • Organization: EarthLink Network, Inc.
  • References: <7bt665$ndn@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <7bt665$ndn at smc.vnet.net>, Roger Mason
<rmason at sparky2.esd.mun.ca> wrote:

> 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


In[1]:= Position[{-1, 3, -2, 1},_?Negative]

Out[1]={{1},{3}}

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