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Re: simple question about removing elements from a table

• To: mathgroup at smc.vnet.net
• Subject: [mg122424] Re: simple question about removing elements from a table
• From: "Dr. Wolfgang Hintze" <weh at snafu.de>
• Date: Fri, 28 Oct 2011 05:34:38 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <j89umn$2e$1@smc.vnet.net>

Select[data, #1[[1]] <= 0 & ]

--- Wolfgang


"Michael B. Heaney" <mheaney at gmail.com> schrieb im Newsbeitrag 
news:j89umn$2e$1 at smc.vnet.net...
> Hi,
>
> I have a data table:
>
> data={{-0.5, 0.0321787}, {-0.489, 0.0321691}, {-0.478,
> 0.032211}, {-0.467, 0.0321723}, {-0.456, 0.0322448}, {-0.444, 
> 0.0321498},
> {-0.433, 0.032132}, {-0.422, 0.0321804}, {-0.411, 0.0322158},
> {-0.4, 0.0320886},  {-0.233,  0.0320596},  {0.567, 0.00286087}, 
> {0.578,
> -0.00143633}, {0.589, -0.00592979}, {0.6, -0.0113609}}
> I want to remove all of the elements that have a positive first 
> number, to
> get:
>
> datasubset={{-0.5, 0.0321787}, {-0.489, 0.0321691}, {-0.478,
> 0.032211}, {-0.467, 0.0321723}, {-0.456, 0.0322448}, {-0.444, 
> 0.0321498},
> {-0.433, 0.032132}, {-0.422, 0.0321804}, {-0.411, 0.0322158},
> {-0.4, 0.0320886},  {-0.233,  0.0320596}}
>
> How do I do this?
>
> Thanks,
>
> Michael
> -- 
> ------------------------------------------------------------
> Michael B. Heaney
> 3182 Stelling Drive
> Palo Alto, CA 94303 USA
> mheaney at alum.mit.edu
> www.linkedin.com/in/michaelbheaney
> ------------------------------------------------------------