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
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