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MathGroup Archive 2004

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Re: DeleteCases : several at once, conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49373] Re: DeleteCases : several at once, conditions
  • From: BobHanlon at aol.com
  • Date: Sat, 17 Jul 2004 06:38:37 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

data={{1,6,7},{3,6,9},{1,2,11},{3,5,9},{2,5,6},{2,9,11},{2,10,11},{3,7,9},{5,
         8,11},{3,7,9},{7,8,9},{2,5,12},{2,6,10},{2,10,11},{1,6,9},{6,10,
         12},{3,6,12},{2,5,12},{3,8,9},{1,2,7}};


DeleteCases[data, {1|3|5|7,_,_}]


{{2, 5, 6}, {2, 9, 11}, {2, 10, 11}, {2, 5, 12}, 
   {2, 6, 10}, {2, 10, 11}, {6, 10, 12}, {2, 5, 12}}


%==DeleteCases[data, {_?OddQ,_,_}]==
   
   DeleteCases[data,{ _?(Mod[#,2]==1&),_,_}]


True


Bob Hanlon

> In a message dated Fri, 16 Jul 2004 10:35:35 +0000 (UTC), 
> camerzone at yahoo.com writes:  Suppose you have a list of lists, something like
> {{1, 6, 7}, {3, 6, 9}, {1, 2, 11}, {3, 5, 9}, {2, 5, 6}, {2, 9, 11}, {
>    2, 10, 11}, {3, 7, 9}, {5, 8, 11}, {3, 7, 9}, {7, 8, 9}, {2, 5, 12},
> {2, 6,
>      10}, {2, 10, 11}, {1, 6, 9}, {6, 10, 12}, {3, 6, 12}, {2, 5, 12},
> {3, 8,
>       9}, {1, 2, 7}}
> and you want to delete cases matching several different patterns, say
> {1,_,_} and {9,_,_}
> What's the most efficient way?
> 
> Also, can you use conditions with DeleteCases?   Say, I want to delete
> all cases containing even numbers?
> 


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