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Re: pattern matching

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128312] Re: pattern matching
  • From: Dana DeLouis <dana01 at me.com>
  • Date: Sat, 6 Oct 2012 01:50:32 -0400 (EDT)
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> Count[Table[RandomInteger[], {n}], 1]/n, {n, 100, 1000, 10}], x_ < .5]

Hi.  Here's one way.

t=Table[Count[Table[RandomInteger[],{n}],1]/n,{n,10,15,1}]

{7/10,4/11,1/2,7/13,3/7,8/15}

Count[t, n_/; n<.5]
2

As a suggestion, note the following with 0 / 1's

Mean[{1,1,0,0,0}]
2/5

Perhaps:

t=Table[Mean[RandomInteger[{0,1},n]],{n,10,15,1}]
{1/2,2/11,2/3,5/13,4/7,2/15}

Count[t, n_/;n<.5]
3

= = = = = = = = = =
HTH  :>)
Dana DeLouis
Mac & Mathematica 8
= = = = = = = = = =




On Friday, October 5, 2012 2:43:42 AM UTC-4, Daniel S wrote:
> Consider the following code:
> 
> 
> 
> Count[Table[
> 
>   Count[Table[RandomInteger[], {n}], 1]/n, {n, 100, 1000, 10}], 
> 
>  x_ < .5]
> 
> 
> 
> I want to count the number of times there are occurrences less than .5 but some how I am not specifying the right pattern.  Any suggestions on getting right?




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