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Re: 100 rows and 100 columns random matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg123449] Re: 100 rows and 100 columns random matrix
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Thu, 8 Dec 2011 05:21:24 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201112071115.GAA04259@smc.vnet.net>

data = RandomReal[{0, 1}, {100, 100}];

Count[data, _?(# < 0.5 &), {2}]

5054

Count[data, _?(# >= 0.5 &), {2}]

4946

% + %% == 100^2

True


Bob Hanlon


On Wed, Dec 7, 2011 at 6:15 AM, Sahar Nazemi <nazemisahar at yahoo.com> wrote:
> Hello
> I'm a student of geology who works with
> Mathematica sofware .I'm learning it by myself recently.
> I have a question and will appreciate if you
> help me in this regard.
> I have created a 100 rows and 100 columns random
> matrix which its elements are between 0 to 1(for example it consists of
> 0.687,...).
> Now I want to know how many of these elements
> are in the range of "0 to 0.5" and how many are in the range of
> "0.5 to 1".
> I also use "Count" function as below
> but it doesnt answer:
> Count[a,{0,0.5}]
> ("a" is my random matrix).
> Regards
> Sahar Nazemi



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