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Re: FindMaximum doesn't converge

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112049] Re: FindMaximum doesn't converge
  • From: Themis Matsoukas <tmatsoukas at me.com>
  • Date: Fri, 27 Aug 2010 04:06:56 -0400 (EDT)

The local maximum is an artifact in the contour plot. Your function has a flat maximum with respect to j at h=0:

FullSimplify[obj /. h -> 0]

-Log[8]

You can examine your function using

Manipulate[
 Column[{Dynamic[H], 
   Plot[obj /. h -> H, {j, -5, 5}, PlotRange -> {-15, 0}]}], {H, -5, 
  5}]

Themis


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