This function is deprecated and will be removed in the next release, as it is
simply a wrapper for the list() function. To construct linked (D)GP structures,
please use the updated lgp() function, which provides a simpler and more efficient
approach to building (D)GP emulators.
combine(...)A list defining a linked (D)GP structure to be passed to struc of lgp().
a sequence of lists. Each list represents a system layer and contains emulators (produced by gp() or
dgp()) in that layer.
See further examples and tutorials at https://mingdeyu.github.io/dgpsi-R/.