R: Empirical variogram

variogram {SpatialExtremes} | R Documentation

## Empirical variogram

### Description

This function computes the empirical variogram.

### Usage

    variogram(data, coord, n.bins, xlab, ylab, angles = NULL, add = FALSE,
    xlim = c(0, max(dist)), ...)

### Arguments

`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 `ylab` must have the same length has `which`.
`angles` | A numeric vector. A partition of the interval (0, π) to help detecting anisotropy.
`add` | Logical. If `TRUE`, the plot is added to the current figure; otherwhise (default) a new plot is computed.
`xlim` | A numeric vector of length 2 specifying the x coordinate range.
`...` | Additional options to be passed to the `plot` function.

### Value

A graphic and (invisibly) a matrix with the lag distances and the empirical variogram estimates.

### Author(s)

Mathieu Ribatet

### See Also

`fmadogram`, `lmadogram`

### Examples

    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)

[Package SpatialExtremes version 2.0-5 Index]