CREATEDIRECTEDCIRCLE Create a directed circle.

   C = createDirectedCircle(P1, P2, P3);
   Creates a circle going through the given points.
   C is a 1*4 array of the form: [XC YC R INV].
   The last parameter is set to 1 if the points are located in clockwise
   order on the circle.

   C = createDirectedCircle(P1, P2);
   Creates the circle whith center P1 and passing throuh the point P2.

   Works also when input are point arrays the same size, in this case the
   result has as many lines as the point arrays.

   See also:
   circles2d, createCircle

   ---------
   author : David Legland 
   INRA - TPV URPOI - BIA IMASTE
   created the 12/01/2005.

Package: matgeom