This function adds or removes the Vecchia approximation from a GP, DGP or linked (D)GP emulator
constructed by gp(), dgp() or lgp().
set_vecchia(object, vecchia = TRUE, M = 25, ord = NULL)An updated object with the Vecchia approximation either added or removed.
an instance of the S3 class gp, dgp, or lgp.
a bool to indicate the addition or removal of the Vecchia approximation:
if object is an instance of the gp or dgp class, vecchia indicates
either addition (vecchia = TRUE) or removal (vecchia = FALSE) of the Vecchia approximation from object.
if object is an instance of the lgp class, vecchia indicates either addition (vecchia = TRUE)
or removal (vecchia = FALSE) of the Vecchia approximation from all individual (D)GP emulators contained in object.
Defaults to TRUE.
the size of the conditioning set for the Vecchia approximation in the (D)GP emulator training. Defaults to 25.
an R function that returns the ordering of the input to the (D)GP emulator for the Vecchia approximation. The function must satisfy the following basic rules:
the first argument represents the lengthscale-scaled input to the GP emulator or the lengthscale-scaled input to a GP node of the DGP emulator.
the output of the function is a vector of indices that gives the ordering of the input to the GP emulator or the input to the GP nodes of the DGP emulator.
If ord = NULL, the default random ordering is used. Defaults to NULL.
See further examples and tutorials at https://mingdeyu.github.io/dgpsi-R/.