Re: function to check if array is empty
- To: mathgroup at smc.vnet.net
- Subject: [mg88345] Re: [mg88313] function to check if array is empty
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Fri, 2 May 2008 03:44:20 -0400 (EDT)
- Organization: Mathematics & Statistics, Univ. of Mass./Amherst
- References: <200805010722.DAA26200@smc.vnet.net>
- Reply-to: murray at math.umass.edu
Your array is hardly "empty": it's full of zeros!
If what you want to do is test to see whether every entry is 0, the
following will do it:
And @@ Thread[0 == Flatten @ X]
]
will parr wrote:
> Dear Math Forum,
>
> this probably already exists, but I can't find it anywhere:
>
> is there a function that will check if an array is empty?
>
> i'm looking for a function to return either True (or 1), or False (or 0) when it checks an array. eg:
>
> X = Array[0 &, {3, 3}]
>
> then test with function (called ArrayEmpty, for example)
>
> In: ArrayEmpty[X]
>
> Out: True
>
> best wishes,
>
> Will
>
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
- References:
- function to check if array is empty
- From: will parr <willpowers69@hotmail.com>
- function to check if array is empty