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   Plots a set of 2-D or 3-D vectors.
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   Form:
   PlotVector( v )
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   ------
   Inputs
   ------
   v             (m,n)   Set of vectors, where m is the dimension (2 or 3), 
                         and n is the number of vectors
   fig            (1)    Figure handle (optional)
   color          (:)    Color of vector (optional, default white)

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   Outputs
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   none

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