Returns the analytical gradient of leaveOneOutFun.
leaveOneOutGrad(param, model, envir)the gradient of leaveOneOutFun at param.
a vector containing the optimization variables.
an object of class km.
an environment specifying where to get intermediate values calculated in leaveOneOutFun.
O. Roustant, Ecole des Mines de St-Etienne
F. Bachoc (2013), Cross Validation and Maximum Likelihood estimations of hyper-parameters of Gaussian processes with model misspecification. Computational Statistics and Data Analysis, 66, 55-69. http://www.lpma.math.upmc.fr/pageperso/bachoc/publications.html
O. Dubrule (1983), Cross validation of Kriging in a unique neighborhood. Mathematical Geology, 15, 687-699.
leaveOneOutFun