How to find vertices with voronoin

Hi guys,

I have one problem finding vertices of hexagonal cell. I created the hexagonal cell using meshgrid and voronoi like in this link. http://matlabdatamining.blogspot.com/2008/04/generating-hexagonal-grids-for-fun-and.html.

The problem is i failed to find the vertices of some cells located in the middle of the figure. I want to use the vertices to use the function of patch in order to fill the cells with color.

I already use voronoin function but failed to define the vertices.

As i put [v,c] = voronoin([X(:) Y(:)]), it will color all the hex cell. Then, i use [v,c] = voronoin([X(4) Y(4)]), but there're errors because it cannot define the vertices of cell number 4. How can i fix that?