Update a modelStruct Object

DESCRIPTION:

This method function updates each element of object, allowing the access to data.

USAGE:

update(object, data) 

REQUIRED ARGUMENTS:

object
an object inheriting from class modelStruct, representing a list of model components, such as corStruct and varFunc objects.
data
a data frame in which to evaluate the variables needed for updating the elements of object.

VALUE:

an object similar to object (same class, length, and names), but with updated elements. NOTE: This method function is primarily used within model fitting functions, such as lme and gls, that allow model components such as variance functions.