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
## S3 method for class 'reStruct':
pdMatrix(object, factor)
Arguments
object
an object inheriting from class reStruct,
representing a random effects structure and consisting of a list of
pdMat objects.
factor
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.
References
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models
in S and S-PLUS", Springer, esp. p. 162.