EDGELENGTH Return length of an edge.

   L = edgeLength(EDGE);  
   Returns the length of an edge, with parametric representation:
   [x1 y1 x2 y2].

   The function also works for several edges, in this case input is a
   N-by-4 array, containing parametric representation of each edge, and
   output is a N-by-1 array containing length of each edge.

   See also:
   edges2d, edgeAngle

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   author : David Legland 
   INRA - TPV URPOI - BIA IMASTE
   created the 19/02/2004

Package: matgeom