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MathGroup Archive 2005

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Re: List searching

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57551] Re: [mg57512] List searching
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Wed, 1 Jun 2005 06:01:36 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

To test whether any element occurs more than once:

data={a,b,c,d,e,f,a};

Length[data]!=Length[Union[data]]

True

To test whether any element exceeds a number

data=Sort[Table[Random[],{10}]]

{0.0629574, 0.0832333, 0.21535, 0.244962, 0.30882,
0.417552, 0.550512, 0.610004, 0.857675, 0.979753}

The numbers are sorted to make it easy to verify the results; sorting is not 
required.

Count[data, _?(#>0.85&)]>0

True


Bob Hanlon

> 
> From: Guy Israeli <guyi1 at netvision.net.il>
To: mathgroup at smc.vnet.net
> Date: 2005/05/31 Tue AM 04:59:03 EDT
> Subject: [mg57551] [mg57512] List searching
> 
> Hello,
> 
> I needed to test lists for certain elements inside of it, however, since I 
> didn't find the proper function I had to write them myself.
> 
> are there functions that can do the following:
> 
> - tests (returns true or false) if within the list there is an element that 
> appears more than once
> 
> - tests if there is an element in the list that is bigger/smaller than a 
> certain number
> 
> I would really appreciate your help,
> 
> Guy 
> 
> 
> 

Bob Hanlon
Chantilly, VA


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