maternArray: Matern covariance
In telefit: Estimation and Prediction for Remote Effects Spatial Process Models

This function evaluates the Matern covariance function for the elements of a vector.

1	maternArray(d, scale = 1, range = 1, smoothness = 0.5, nugget = 0)

`d`	A numeric vector of distances at which the Matern correlation function should be evaluated.
`scale`	Scales correlations to covariances.
`range`	Matern range parameter. Controls the decay of pointwise correlations as a function of distance.
`smoothness`	Matern smoothness parameter. Controls the number of process derivatives.
`nugget`	Spatial covariance nugget.