Perform the semi-variogram of a 2D dataset.
[K,L,D,S] = NL_F_SemiVariogram(X,Y,Z)
x-coordinate of the measurements.
y-coordinate of the measurements.
Value of the measurements.
Index vector (head).
Index vector (tail).
Distance vector.
Semi-variance vector.
NL_F_SemiVariogram performs the semi-variance vector (WIKIPEDIA) S of a dataset described with measurement points of values Z located in [X,Y]. [K,L] provides the source and destination (inter-distance D) of all couples of points where we compute the semi-variance parameter.