This method function extracts the correlation matrix, or list of
correlation matrices, associated with
object.
USAGE:
as.matrix(x)
REQUIRED ARGUMENTS:
x
an object inheriting from class
corStruct,
representing a correlation structure.
VALUE:
If the correlation structure includes a grouping factor, the returned
value will be a list with components given by the correlation
matrices for each group. Otherwise, the returned value will be a
matrix representing the correlation structure associated with
object
.