An arbitrary covariance kernel provided by the user
Arguments
Objects from the Class
Any valid covariance kernel, provided as a 2-dimensional function (x,y) -> k(x,y). At this stage, no test is done to check that k is positive definite.
Slots
kernel:
Object of class "function". The new covariance kernel.
nugget.flag:
Object of class "logical". Is there a nugget effect?
nugget:
Object of class "numeric". If there is a nugget effect, its value (homogeneous to a variance).