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Re: Select All Lists Where Any Element is a Given Value

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96605] Re: [mg96586] Select All Lists Where Any Element is a Given Value
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 17 Feb 2009 06:24:52 -0500 (EST)
  • Reply-to: hanlonr at cox.net

X = {{1, 2, 3}, {8, NA, 20}, {-7, 9, NA}};

Select[X, ! FreeQ[#, NA] &]

{{8, NA, 20}, {-7, 9, NA}}

Cases[X, _?(! FreeQ[#, NA] &)]

{{8, NA, 20}, {-7, 9, NA}}

DeleteCases[X, _?(FreeQ[#, NA] &)]

{{8, NA, 20}, {-7, 9, NA}}

X /. _List?(FreeQ[#, NA] &) :> Sequence[]

{{8, NA, 20}, {-7, 9, NA}}


Bob Hanlon

---- Gregory Lypny <gregory.lypny at videotron.ca> wrote: 

=============
Hello everyone,

Suppose I have the list

	X = {{1, 2, 3}, {8, NA, 20}, {-7, 9, NA}},

where NA is a string, although it need not be.  How can I use Select  
to pull out all lists in X where NA appears in any element?  In this  
example, I want to pull out the second and third list.

		Regards,

			Gregory
		



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