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Re: Count inside a matrix?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128015] Re: Count inside a matrix?
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Sun, 9 Sep 2012 05:08:46 -0400 (EDT)
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  • References: <20120908070948.80D4C685C@smc.vnet.net>

matrix = Table[RandomInteger[{0, 10}], {5}, {3}]

{{3, 5, 7}, {5, 2, 9}, {7, 3, 7}, {6, 4, 1}, {2, 5, 8}}

Use levelspec argument to Count

Count[matrix, 5, 2]

3

Count[matrix, _?(# > 5 &), 2]

6

Or flatten matrix before using Count

Count[Flatten[matrix], 5]

3

Count[Flatten[matrix], _?(# > 5 &)]

6


Bob Hanlon


On Sat, Sep 8, 2012 at 3:09 AM, Sergio Sergio <zerge69 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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