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MathGroup Archive 2007

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Re: Logical comparisons of items in a two lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75462] Re: Logical comparisons of items in a two lists
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 2 May 2007 03:45:24 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <f16q2u$7er$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

l1 = Table[Random[], {10}];
l2 = Table[Random[], {10}];

k = 0;
MapThread[If[#1 > #2, k++] &, {l1, l2}];
k

Regards
   Jens

actuary at mchsi.com wrote:
> Hello:
> 
> I have two lists of real numbers, a & b.  I want two compare
> individual items in one list to the corresponding items in the other
> list.  For example Is a[[1]] > b[[1]]. At the end of the comparisons,
> I want to count the "Trues".  I know how to do this use a "Table"
> statement and a "Count" statement.  Is there a quicker, more efficient
> way of counting the number of "Trues".
> 
> Thanks
> 
> Larry
> 
> 


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