OptTestFunRosenbrock:

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   Rosenbrock test function.
   f = 100*(x(1)^2-x(2))^2 + (1-x(1))^2

   Since version 7.
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   Form:
   f = OptTestFunRosenbrock( x, d )
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   Inputs
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   x              (2,1)  Value of x
   d              (1,1)  Structure to pass to fun (not used)

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   Outputs
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   f              (1,1)  Cost

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