An Mx3 matrix, where M is the number of triangles. Each row contains the indices of a
triangle in the x and y matrices. Usually,
tri is the output of the delaunay function.
Type: integer
Dimension: vector | matrix
x, y
Coordinates of the vertices.
Type: double | integer
Dimension: vector | matrix
fmt
Formatting string for the curve. It can be any combination of the following strings:
line style: '-', '-.', ':', '--', '-:'.
line color: 'r', 'g', 'b', 'c', 'y', 'm', 'w', 'k'.