# fields, Tools for spatial data
# Copyright 2004-2007, Institute for Mathematics Applied Geosciences
# University Corporation for Atmospheric Research
# Licensed under the GPL -- www.gpl.org/licenses/gpl.html
"Krig.find.REML" <- function(info, lambda.grid, llike, 
    llike.fun, tol, verbose = TRUE, give.warnings = FALSE) {
    #
    # NOTE give.warnings set to FALSE to avoid numerous messages for
    # the standard fields examples.
    #
    ind <- !is.na(llike)
    lambda.grid <- lambda.grid[ind]
    llike <- llike[ind]
    nstep.cv <- length(lambda.grid)
    il <- order(llike)[1]
    lambda.llike <- lambda.grid[il]
    llike.raw <- min(llike)
    if (verbose) {
        cat("Results of coarse search lambda and  restricted Log Likelihood:", 
            lambda.llike[il], llike.raw, fill = TRUE)
    }
    if ((il > 1) & (il < nstep.cv)) {
        out <- golden.section.search(lambda.grid[il - 1], lambda.grid[il], 
            lambda.grid[il + 1], llike.fun, f.extra = info, tol = tol * 
                llike.raw)
        return(out$x)
    }
    else {
        if (give.warnings) {
            warning("Search for REML estimate of smoothing paramter gives a\nmaximum at the endpoints of the grid search")
        }
        return(lambda.llike)
    }
}