Re: Two questions related to Arrays
- To: mathgroup at smc.vnet.net
- Subject: [mg113325] Re: Two questions related to Arrays
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sat, 23 Oct 2010 07:08:08 -0400 (EDT)
Array is not a Head and does not appear in the FullForm of the expression
{{{1}, {2}}, {3, 4}, {{5}, 6}} // FullForm
Use
Cases[{{{1}, {2}}, {3, 4}, {{5}, 6}}, {{__} ..}]
{{{1}, {2}}}
I don't understand your second question but you should look at MatrixQ
f[t_?MatrixQ] :=
Bob Hanlon
---- Sam Takoy <sam.takoy at yahoo.com> wrote:
=============
Hi,
First, why doesn't the following return the first two elements of the
outer list:
Cases[{{{1}, {2}}, {3, 4}, {{5}, 6}}, _Array]
Second, I'm looking for help writing a function
f[t__]:=
that returns Outer[Times, u] where u only includes the input variables
that are Arrays.
Many thanks in advance,
Sam