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Re: Parts of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15536] Re: [mg15430] Parts of a list
  • From: jtischer at col2.telecom.com.co (Cl-Jurgen Tischer)
  • Date: Tue, 26 Jan 1999 13:44:26 -0500 (EST)
  • Organization: Universidad del Valle
  • References: <199901140157.UAA02693@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

Hossein,

In[1]:= Select[x,#[[2]]!=0&]

Out[1]= {{2.5,0.5},{0,2}}

In[2]:= DeleteCases[x,{_,0}]

Out[2]= {{2.5,0.5},{0,2}}

In[3]:= Cases[x,{_,_?(#!=0&)}]

Out[3]= {{2.5,0.5},{0,2}}

Jurgen

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 som.umass.edu



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