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Re: Parts of a list

  • To: mathgroup at
  • Subject: [mg15440] Re: [mg15430] Parts of a list
  • From: "C. Frey" <Clemens.Frey at>
  • Date: Mon, 18 Jan 1999 04:21:44 -0500
  • Sender: owner-wri-mathgroup at


for this task you can use both Select and Cases; in the latter case you
have to use a conditional pattern. Just look at the following examples:

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

Then use




Hope that helped


Clemens Frey
Doctoral Fellow at the 
Department of Mathematics/BITOEK
University of Bayreuth(Germany)

clemens.frey at

On Wed, 13 Jan 1999, Hossein Kazemi wrote:

> 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

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