lines.variomodel.grf {geoR} | R Documentation

## Lines with True Variogram for Simulated Data

### Description

This functions adds to the graphics device a line with the theoretical (true) variogram used when generating simulations with the function `grf`.

### Usage

    ## S3 method for class 'grf':
    lines.variomodel(x, max.dist = max(dist(x$coords)),
    length = 100, lwd = 2, ...)

### Arguments

`x` | an object from the class `grf` typically an output of the function `grf`.
`max.dist` | maximum distance to compute and plot the true variogram. Defaults to the maximum distance between two data locations.
`length` | number of points used to compute and draw the variogram line.
`lwd` | width of the line.
`...` | further arguments to be passed to the function `curve`.

### Value

A line with the true variogram model is added to the current plot on the graphics device. No values are returned.

### Author(s)

Paulo J. Ribeiro Jr. paulojus@leg.ufpr.br,
Peter J. Diggle p.diggle@lancaster.ac.uk.

### References

Further information on the package geoR can be found at:
http://www.leg.ufpr.br/geoR.

### See Also

`lines.variomodel`, `grf`, `plot.grf`, `curve`.

### Examples

    sim <- grf(100, cov.pars=c(1, .25)) # simulates data
    plot(variog(sim, max.dist=1))       # plot empirical variogram

[Package geoR version 1.6-19 Index]