OptTestFunEcon:

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   There are two optima:
   F(.864,1.23) = 16.0817 (the global minumum) and F(2.35,-.319) = 20.9805.

   Since version 7.
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   Form:
   f =  OptTestFunEcon( x, d )
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   ------
   Inputs
   ------
   x              (20,1)  Value of x
   d              (1,1)   Structure to pass to fun (not used)

   -------
   Outputs
   -------
   f              (1,1)  Cost

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