Nothing
suppressPackageStartupMessages(library(RandomFields))
######### set parameters #########
set.seed(1988)
spatial.dim = 2
n = 10**2
frac.obs = 0.3
m = 10
## covariance parameters
sig2 = 0.5; range = .15; smooth = 0.5;
covparms = c(sig2,range,smooth)
#covfun = function(locs) GPvecchia::MaternFun(fields::rdist(locs),covparms)
#covfun.d = function(D) GPvecchia::MaternFun(D, covparms)
## likelihood settings
me.var = 0.1;
data.model = "gauss"
lik.params = list(data.model = data.model, sigma = sqrt(me.var), alpha=2)
## generate grid of pred.locs
grid.oneside = seq(0,1,length = round(sqrt(n)))
locs = as.matrix(expand.grid(grid.oneside,grid.oneside))
## set initial state
x = matrix(RFsimulate(model = RMmatern(nu = smooth, scale = range, var = sig2),
x = locs[,1], y = locs[,2], spConform = FALSE), ncol = 1)
n.obs = round(frac.obs*n)
obs.inds = sample(n, n.obs)
eps = me.var*rnorm(length(obs.inds))
y = rep(NA, n)
y[obs.inds] = x[obs.inds] + eps
nuggets = rep(me.var, n.obs)
###### specify Vecchia approximation #######
vecchia.approx = vecchia_specify(locs, m, 'maxmin', conditioning='mra', verbose=FALSE)
posterior = vecchia_likelihood(y, vecchia.approx, covparms = covparms, nuggets)
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