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Re: Two questions related to Arrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113330] Re: Two questions related to Arrays
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Sat, 23 Oct 2010 07:09:05 -0400 (EDT)

On 10/22/10 at 1:35 AM, sam.takoy at yahoo.com (Sam Takoy) wrote:

>First, why doesn't the following return the first two elements of
>the outer list:

>Cases[{{{1}, {2}}, {3, 4}, {{5}, 6}}, _Array]

This returns an empty list because nothing in what you supply
has head Array. Every thing is either a list or an integer in
your example.

Cases[{{{1}, {2}}, {3, 4}, {{5}, 6}}, _List]

will return the entire list since it matches the pattern.

Cases[{{{1}, {2}}, {3, 4}, {{5}, 6}}, _?ArrayQ]

will return the first two elements




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