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simple question about removing elements from a table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122345] simple question about removing elements from a table
  • From: "Michael B. Heaney" <mheaney at gmail.com>
  • Date: Wed, 26 Oct 2011 17:37:09 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

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
-- 
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Michael B. Heaney
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mheaney at alum.mit.edu
www.linkedin.com/in/michaelbheaney
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