The define of "dual" delaunay triangle from Voronoi diagram

p=dlmread('knot.pts'); where p is Nx3 ,matrix dt=DelaunayTri(p); [V R]=dt.voronoiDiagram(); According to Voronoi concepts ,"the delaunay triangle are dual to voronoi edge". It is possible I define the "dual triangle" of voronoi edge by based on R or V ? As i not wrong , the dt is based on dt.x and R is also based on dt.x. Second questions , [V R]=dt.voronoiDiagram() command has provide any method to define Voronoi edge? Thank you