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MathGroup Archive 2004

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Re: DeleteCases : several at once, conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49403] Re: [mg49369] DeleteCases : several at once, conditions
  • From: Yasvir Tesiram <yat at omrf.ouhsc.edu>
  • Date: Sat, 17 Jul 2004 06:39:54 -0400 (EDT)
  • References: <200407161006.GAA24904@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
For the first case;

v2 = {{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}}

Fold[DeleteCases, v2, {{1, _, _}, {_, _, 9}}]

and for the second case;

v1 = Range[20]
DeleteCases[v1, _?EvenQ]

Cheers
Yas


On Jul 16, 2004, at 5:06 AM, camerzone wrote:

> 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?
>
> tks


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