es) from a matrix
 
  BTKSETPOINTVALUES(H, INDEX, V) uses the matrix V to set point's coordinates.
  The number of rows of the matrix corresponds to the number of frames 
  in the acquisition.  The number of columns of this matrix corresponds 
  to the coordinates of the point.
  The biomechanical acquisition handle H is represented as a double and
  can be only used with the btk* functions.

  BTKSETPOINTVALUES(H, LABEL, V) uses the point's label to extract the point 
  to modify.</pre></div>

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