Re: Extraction of positive values from list of both +/- values
- To: mathgroup at smc.vnet.net
- Subject: [mg34651] Re: [mg34637] Extraction of positive values from list of both +/- values
- From: BobHanlon at aol.com
- Date: Fri, 31 May 2002 04:26:29 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 5/30/02 3:24:34 AM, divinesaam at aol.com writes:
>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.
>
lstvals={700,600,500,400,300,200,100,-50,100,-200,-300};
Select[lstvals, #>0&]
{700, 600, 500, 400, 300, 200, 100, 100}
or
Cases[lstvals, _?Positive]
{700, 600, 500, 400, 300, 200, 100, 100}
If you also want to eliminate duplicates use Union
Bob Hanlon
Chantilly, VA USA