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Find Max of "Concave" List

  • To: mathgroup at
  • Subject: [mg12918] Find Max of "Concave" List
  • From: "Chris Farr" <farr at>
  • Date: Wed, 24 Jun 1998 03:44:38 -0400
  • Sender: owner-wri-mathgroup at

I have a one-dimensional list which is concave.  That is, if you did a 
ListPlot on the list you would have a concave curve.

Given the concavity, when finding the max, it is inefficient to use 
Max[] which does a comparison on all elements of the list.

Is there an elegant way to exploit the concavity when performing a 
Max[]?  That is, the algorithm should stop when the next element in the
 list is lower then the previous element.  This would limit the number
of  comparisons.


Chris Farr

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