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Re: Parts of a list

  • To: mathgroup at
  • Subject: [mg15493] Re: Parts of a list
  • From: "Donald E. Niman <>" <Donald at>
  • Date: Mon, 18 Jan 1999 04:22:36 -0500
  • Organization: Consultant
  • References: <77jkve$>
  • Sender: owner-wri-mathgroup at

In a dream I recall that on 13 Jan 1999 21:32:14 -0500, in article
<77jkve$304 at>, "Hossein blurted out thus...
>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
>kazemi at

The Select function works with anonymous functions.  Anonymous functions
have two variations in syntax.  Here are some solutions using both:

Given your list,

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




both give the desired result.

Donald E. Niman
Peoria Arizona and Rancho Cucamonga California My opinions today do not
necessarily reflect my earlier opinions.

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