Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Re: simple question about removing elements from a table

• To: mathgroup at smc.vnet.net
• Subject: [mg122406] Re: simple question about removing elements from a table
• From: Michael Stern <nycstern at gmail.com>
• Date: Thu, 27 Oct 2011 06:33:40 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201110262137.RAA29967@smc.vnet.net>

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


On Oct 26, 2011, at 5:37 PM, Michael B. Heaney wrote:

> 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
> ------------------------------------------------------------

• References:
  • simple question about removing elements from a table
    • From: "Michael B. Heaney" <mheaney@gmail.com>