How to create variogram ?

I would like to create variogram of gridding of the data. I find these matlab function

variogramfit.m

https://www.mathworks.com/matlabcentral/fileexchange/25948-variogramfit

but the problem is that I do not understand how to use it. Could you please help me?

[Jan]

The question is very general. The code contains an exhaustive help section. Which detail is not clear to you?