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MathGroup Archive 2005

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Re: Select from list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61082] Re: [mg61045] Select from list
  • From: Igor Antonio <igora at wolf-ram.com>
  • Date: Sun, 9 Oct 2005 01:36:26 -0400 (EDT)
  • Organization: Wolfram Research, Inc.
  • References: <200510080649.CAA20981@smc.vnet.net>
  • Reply-to: igora at wolf-ram.com
  • Sender: owner-wri-mathgroup at wolfram.com

Steven Taracevicz wrote:
> hi:
> 
> I read a text file that gives me a list.
> nLevel[8, 10] = Import["output8_10.txt", "List"]
> 
> {-10,-9,-7,-3,1,3,3,17}
> 
> I have no problems calculating mean, variance etc. with the list.
> 
> When I use:
> 
> Select[nLevel[8,10], #<0]
> 
> yields
> 
> {}
> 
> despite negative elements.
> 
> I cannot figure out why.
> 
> Thanks,
> 

Steven,

Your syntax is incorrect.  The second argument of Select needs to be a 
*function* (either built-in or a pure funtion).  Note the "&" you're missing.

In[2]:=
Select[{-10,-9,-7,-3,1,3,3,17}, (#<0)&]

Out[2]=
{-10,-9,-7,-3}

-- 


Igor C. Antonio
Wolfram Research, Inc.
http://www.wolfram.com

To email me personally, remove the dash.


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