R/get.contr.R In gstat: Spatial and Spatio-Temporal Geostatistical Modelling, Prediction and Simulation

```# \$Id: get.contr.q,v 1.8 2006-03-20 15:18:14 edzer Exp \$

"get.contr" <-
function (data, gstat.object, X, ids = names(gstat.object\$data))
{
contr.fun <- function(x, n, pr.idx, cov.idx, contr) {
y = matrix(x[pr.idx], n, 1)
V = matrix(x[cov.idx], n, n)
beta = t(contr) %*% y
Vbeta = t(contr) %*% V %*% contr
ret = c(beta, diag(Vbeta))
for (j in 1:nrow(Vbeta)) {
if (j > 1)
for (k in 1:(j - 1))
ret = c(ret, Vbeta[j, k])
}
ret
}
lti <- function(i, j) { # lower triangular matrix index, when repr as array
mx = max(i, j) - 1
mn = min(i, j) - 1
((mx) * (mx - 1))/2 + mn + 1
}
n = length(ids)
if (!is.matrix(X))
X = as.matrix(X)
if (n != nrow(X))
stop("length(ids) should equal nrow(X) or length(X)")
gstat.names = create.gstat.names(ids)
names.pr = gstat.names[seq(1, 2 * n, 2)]
names.cov = matrix("", n, n)
for (i in 1:n)
for (j in 1:n)
names.cov[i, j] = ifelse(i == j, gstat.names[2 * i],
gstat.names[2 * n + lti(i, j)])
pr.idx = match(names.pr, names(data))
cov.idx = match(names.cov, names(data))
if (any(is.na(pr.idx)) || any(is.na(cov.idx)))
stop("colunn names in data not matched")

res = data.frame(t(apply(as.data.frame(data)[names(data)], 1,
contr.fun, n = n, pr.idx = pr.idx, cov.idx = cov.idx,
contr = X)))

col.names = NULL
for (j in 1:NCOL(X))
col.names = c(col.names, paste("beta", j, sep = "."))
for (j in 1:NCOL(X))
col.names = c(col.names, paste("var.beta", j, sep = "."))
for (j in 1:NCOL(X)) {
if (j > 1) {
for (k in 1:(j - 1)) {
col.names = c(col.names, paste("cov.beta",
k, j, sep = "."))
}
}
}
names(res) = col.names
if (is(data, "data.frame"))
row.names(res) = row.names(data)
else if (is(data, "SpatialPolygonsDataFrame")) {
rownames(res) = sapply(data@polygons, function(x) slot(x, "ID"))
res = SpatialPolygonsDataFrame(as(data, "SpatialPolygons"), res,
match.ID = TRUE)
} else if (is(data, "Spatial")) {
coordinates(res) = coordinates(data)
gridded(res) = gridded(data)
}
res
}
```

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gstat documentation built on May 31, 2017, 2:47 a.m.