Re: function to check if array is empty

*To*: mathgroup at smc.vnet.net*Subject*: [mg88317] Re: [mg88313] function to check if array is empty*From*: "Adriano Pascoletti" <adriano.pascoletti at gmail.com>*Date*: Thu, 1 May 2008 06:27:08 -0400 (EDT)*References*: <200805010722.DAA26200@smc.vnet.net>

Will, a null row is a list of one or more 0's {(0)..} and a null matrix is a list of one or more null rows {{(0)..}..}, so In[4]:= MatchQ[X, {{(0) ..} ..}] Out[4]= True and ArrayEmpty=MatchQ[#, {{(0) ..} ..}]& If you want to match both exact and approximate 0's replace (0).. with (0|0.).. Adriano Pascoletti On Thu, May 1, 2008 at 9:22 AM, will parr <willpowers69 at hotmail.com> 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 > >

**References**:**function to check if array is empty***From:*will parr <willpowers69@hotmail.com>