EstimateVar — Calculates process variance and noise for kriging model.
[model]=EstimateVar(model)
Calculates process variance and noise for kriging model. Updates model.sigma - estimated process variance, model.noise - estimated noise, model.coefcov - parameter, that links correlation matrix to covariance matrix. C= model.coefcov*R;
Note: This function uses global variables Tyfb_kriging Ty_kriging.