Cross:

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   Vector cross product. 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:
   wxy = Cross( w, y )
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   ------
   Inputs
   ------
   w                 (3)    Vector
   y                 (3)    Vector

   -------
   Outputs
   -------
   wxy               (3)    Vector cross product of w and y

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