MathGroup Archive 1999

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

Search the Archive

Re: Parts of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15447] Re: Parts of a list
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Mon, 18 Jan 1999 04:21:49 -0500
  • References: <77jkve$304@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hossein Kazemi wrote in message <77jkve$304 at smc.vnet.net>...
>I have a list (matrix) that looks like this
>
>x={{1,0},{2.5, .5},{3,0},{0,2}}
>
>Now I want to eliminate those vectors that have zero for the second
>case. That is, I want to get
>
>{{2.5, .5},{0,2}}.
>
>Is there a quick way of doing this?
>I tried to apply Select to this but could not get it to work.
>
>Thanks for your help.
>
>Hossein Kazemi
>UMass
>kazemi at som.umass.edu


Kazem,

x={{1,0},{2.5, .5},{3,0},{0,2}};

DeleteCases[x, {_, 0 | 0.0}]

    {{2.5, 0.5}, {0, 2}}

I include the alternative 0.0 to allow for 0.0 as well as the exact 0.

Allan.

---------------------
Allan Hayes
Mathematica Training and Consulting
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565




  • Prev by Date: Re: Data fitting with Mathematica 3.0
  • Next by Date: Re: Visualizing 3D LP-problems
  • Previous by thread: Re: Parts of a list
  • Next by thread: Parts of a list