Extract Matrix or Square-Root Factor from Components of an reStruct Object

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. Defaults to FALSE.

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.

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.

Author(s)

Jose Pinheiro and Douglas Bates

See Also

as.matrix.reStruct, link{reStruct}, pdMatrix.pdMat

Examples

library(lme)
rs1 <- reStruct(pdSymm(diag(3)))
pdMatrix(rs1)

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