Returns the exact gradient vector of the concentrated log-likelihood.
logLikGrad(param, model, envir)a vector containing the optimization variables.
an object of class km.
an environment specifying where to get intermediate values calculated in logLikFun.
the gradient of the concentrated log-likelihood.
J.-S. Park and J. Baek (2001), Efficient computation of maximum likelihood estimators in a spatial linear model with power exponential covariogram, Computer Geosciences, 27 no. 1, 1-7.