# covMatrix: Covariance matrix

## Description

Computes the covariance matrix at a set of locations for a spatial random process with a given covariance structure.

## Usage

covMatrix(object, X, noise.var = NULL)

## Arguments

object

an object specifying the covariance structure.

X

a matrix whose columns represent locations.

noise.var

for noisy observations : an optional vector containing the noise variance at each observation

## Value

a list with the following items :

Ca matrix representing the covariance matrix for the locations specified in the X argument, including a possible nugget effect or observation noise.

vna vector of length `n`

(`X`

size) containing a replication of the nugget effet or the observation noise (so that `C-diag(vn)`

contains the covariance matrix when there is no nugget effect nor observation noise)