Empirical variogram
This function computes the empirical variogram.
variogram(data, coord, n.bins, xlab, ylab, angles = NULL, add = FALSE, xlim = c(0, max(dist)), ...)
data |
A matrix representing the data. Each column corresponds to one location. |
coord |
A matrix that gives the coordinates of each location. Each row corresponds to one location. |
n.bins |
The number of bins to be used. If missing, pairwise madogram estimates will be computed. |
xlab,ylab |
The x-axis and y-axis labels. May be missing. Note
that |
angles |
A numeric vector. A partition of the interval (0, π) to help detecting anisotropy. |
add |
Logical. If |
xlim |
A numeric vector of length 2 specifying the x coordinate range. |
... |
Additional options to be passed to the |
A graphic and (invisibly) a matrix with the lag distances and the empirical variogram estimates.
Mathieu Ribatet
n.site <- 20 n.obs <- 100 coord <- matrix(runif(2 * n.site, 0, 10), ncol = 2) data <- rgp(n.obs, coord, "powexp", sill = 2, range = 3, smooth = 1) variogram(data, coord)
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