Hi, there, I would like to compute covariance or variogram matrix on some data set.. "expcov" or "variogram" function basically give me a big look up table, say map covariance value to some lag distance.. I suppose one way to get the covariance matrix is to first generate a fine grained lookup table, when i need a covariance value for some distance value, I can look in the big lookup table, find the closet match?? It is sort of a tedious job even if i write some program to do it.. I am wondering is there some built in functionality to acheive that? Or is there an easier way to generate covariance matrix?? any suggestions is appreciated, yan