Extract Matrix or Square-Root Factor from an reStruct Object
DESCRIPTION:
This method function extracts the positive-definite matrices
corresponding to the
pdMat elements of
object, or
square-root factors of the positive-definite matrices.
USAGE:
pdMatrix(object, fact)
REQUIRED ARGUMENTS:
object
an object inheriting from class
reStruct,
representing a random effects structure and consisting of a list of
pdMat objects.
OPTIONAL ARGUMENTS:
fact
an optional logical value. If
TRUE, square-root
factors of the positive-definite matrices represented by the elements
of
object are returned; else, if
FALSE, the
positive-definite matrices are returned. Defaults to
FALSE.
VALUE:
a list with components given by the positive-definite matrices
corresponding to the elements of
object, or square-root factors
of the positive-definite matrices.
SEE ALSO:
,
,
EXAMPLES:
rs1 <- reStruct(pdSymm(diag(3), form = ~age + Sex, data = Orthodont))
pdMatrix(rs1)