tournSelect:

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   Performs a tournament selection.

   Since version 7.
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   Form:
   [newPop] = tournSelect(oldPop,options)
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   ------
   Inputs
   ------  
   oldPop                 the current population
   options                options to normGeomSelect [gen tournament_size]

   -------
   Outputs
   -------
   newPop                 the new population selected from the oldPop

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