gear (version 0.1.5)

cmod.man: Standard covariance models for geostatistical data.

Description

cmod.man manually creates a covariance matrix object (cmodMan) for geostatistical data.

Usage

cmod.man(v, evar = 0)

Arguments

v

The covariance matrix of the observed data, including any errors. The matrix should be square, symmetric, and positive definite, though that latter two conditions are not checked.

evar

The variance of the errors. Must be non-negative number. The default is 0.

Value

Returns a cmodMan object.

Details

Note that v includes the error variance, i.e., v = vz + ve, where vz is the covariance matrix of the filtered (non-noisy) process, and the variance matrix of the errors is ve = diag(evar/weights), where the weights come from the geolm object the covariance object is associated with.

Examples

# NOT RUN {
coords = matrix(runif(20), ncol = 2)
d = as.matrix(dist(coords))
cmod.man(v = exp(-d), evar = 1) 
# }