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RE: Extraction of positive values from list of both +/- values

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34663] RE: [mg34637] Extraction of positive values from list of both +/- values
  • From: "David Park" <djmp at earthlink.net>
  • Date: Fri, 31 May 2002 04:26:51 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Oscar,

Select[lstvals, Positive]
{700, 600, 500, 400, 300, 200, 100, 100}

Take[lstvals, 7]
{700, 600, 500, 400, 300, 200, 100}

actually misses one.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 


> From: O.A. Linares, M.D., Ph.D. [mailto:divinesaam at aol.com]
To: mathgroup at smc.vnet.net
> 
> Dear Colleagues,
> 
> I have a list of values:
> 
> lstvals={700, 600, 500, 400, 300, 200, 100, -50, 100, -200, -300}
> 
> I want to create a list that contains only the positive values. I 
> know I can use 
> 
> lst=Take[lstvals, 7]
> 
> The problem is, the size of the vectors vary. Help appreciated.
> 
> Thanks,
> 
> Oscar
> 


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