Dot:

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   Dot product with support for arrays. 
   The number of columns of w and y can be:
   - Both > 1 and equal
   - One can have one column and the other any number of columns

   Since version 1.
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   Form:
   d = Dot ( w, y )
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   Inputs
   ------
   w                 (:,:)  Vector
   y                 (:,:)  Vector

   -------
   Outputs
   -------
   d                 (1,:)   Dot product of w and y

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