Re: Parts of a list
- To: mathgroup at smc.vnet.net
- Subject: [mg15438] Re: [mg15430] Parts of a list
- From: Andrzej Kozlowski <andrzej at tuins.ac.jp>
- Date: Mon, 18 Jan 1999 04:21:42 -0500
- Sender: owner-wri-mathgroup at wolfram.com
The best way is to use DeleteCases :
In[23]:=
x={{1,0},{2.5, .5},{3,0},{0,2}}
Out[23]=
{{1,0},{2.5,0.5},{3,0},{0,2}}
In[24]:=
DeleteCases[x,{x_,0}]
Out[24]=
{{2.5,0.5},{0,2}}
On Wed, Jan 13, 1999, Hossein Kazemi <kazemi at som.umass.edu> 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 som.umass.edu
>
>
Andrzej Kozlowski
Toyama International University
JAPAN
http://sigma.tuins.ac.jp/
http://eri2.tuins.ac.jp/