coranaEval:

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   Determines the value of the Corana function at point sol.
   This function is used in gademo2.

   Since version 7.
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   Form:
   [val] = coranaEval(sol)
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   Inputs
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   sol              the location to evaluate the Corana function        
  
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   Outputs
   -------
   val              the value of the Corana function at point sol

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