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MathGroup Archive 2004

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Re: DeleteCases : several at once, conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49387] Re: DeleteCases : several at once, conditions
  • From: "Dana DeLouis" <delouis at bellsouth.net>
  • Date: Sat, 17 Jul 2004 06:38:54 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Here is one idea.  The "Or" character | is above the \ key on my keyboard.

v = {{1, 6, 7}, ...your data..{1, 2, 7}};

DeleteCases[v, {1 | 9 | 3,___}]

{{2, 5, 6}, {2, 9, 11},
{2, 10, 11}, {5, 8, 11},
{7, 8, 9}, {2, 5, 12},
{2, 6, 10}, {2, 10, 11},
{6, 10, 12}, {2, 5, 12}}

> Also, Say, I want to delete
> all cases containing even numbers?

DeleteCases[v, {___, _?EvenQ, ___}]

{{3, 5, 9}, {3, 7, 9}, {3, 7, 9}}


HTH
Dana DeLouis

"camerzone" <camerzone at yahoo.com> wrote in message
news:cd8b1n$olb$1 at smc.vnet.net...
> 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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