nlme (version 3.1-1)

pdMatrix.reStruct: Extract Matrix or Square-Root Factor from Components of 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)

Arguments

object

an object inheriting from class reStruct, representing a random effects structure and consisting of a list of pdMat objects.

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. Defa

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

as.matrix.reStruct, reStruct, pdMatrix.pdMat

Examples

data(Orthodont)
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdMatrix(rs1)