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Re: Count inside a matrix?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128034] Re: Count inside a matrix?
  • From: David Reiss <dbreiss at gmail.com>
  • Date: Mon, 10 Sep 2012 04:04:40 -0400 (EDT)
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  • References: <k2er00$k90$1@smc.vnet.net>

Use the 3rd argument of Count to specify the level down which to go in
the pattern matching.  E.g.:

In[1]:= mat = {
  {1, a, b, \[Pi]},
  {E, 2, 3, 1/3}
  }

Out[1]= {{1, a, b, \[Pi]}, {E, 2, 3, 1/3}}

In[2]:= Count[mat, _Integer, 2]

Out[2]= 3



On Sep 8, 3:11 am, Sergio Sergio <zerg... at gmail.com> wrote:
> Hi, does anybody know how to count elements within a matrix?
> I know how that Count works for lists, but it does not seem to work for a matrix.
> Any tips?
>
> Thanks




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