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)