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Re: simple question about removing elements from a table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122407] Re: simple question about removing elements from a table
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Thu, 27 Oct 2011 06:33:50 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j89umn$2e$1@smc.vnet.net>

On Oct 26, 2:39 pm, "Michael B. Heaney" <mhea... at gmail.com> 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?

DeleteCases[data,{_?Positive,_}]



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