| variog4 {geoR} | R Documentation |
Computes directional variograms for 4 directions provided by the user.
variog4(geodata, coords = geodata$coords, data = geodata$data,
uvec = "default", trend = "cte", lambda = 1,
option = c("bin", "cloud", "smooth"),
estimator.type = c("classical", "modulus"),
nugget.tolerance = 0, max.dist = NULL, pairs.min = 2,
bin.cloud = FALSE, direction = c(0, pi/4, pi/2, 3*pi/4),
tolerance = pi/8, unit.angle = c("radians", "degrees"),
messages.screen = TRUE, ...)
Most arguments are the same as for the function variog.
The only exception is the following.
direction |
a vector with values of 4 angles, indicating the
directions for which the variograms will be computed. Defaults to
c(0, 45, 90, 135) (degrees). |
The output is an object of the class variog4,
a list with five components.
The first four elements are estimated variograms for the directions
provided and the last is the omnidirectional variogram.
Each individual component is an object of the class variogram,
an output of the function variog.
Paulo J. Ribeiro Jr. Paulo.Ribeiro@est.ufpr.br,
Peter J. Diggle p.diggle@lancaster.ac.uk.
Further information about geoR can be found at:
http://www.maths.lancs.ac.uk/~ribeiro/geoR.html.
variog for variogram calculations and
plot.variog4 for plotting results
if(is.R()) data(s100) var4 <- variog4(s100, max.dist=1) plot(var4)