pdMatrix.reStruct {nlme} | R Documentation |
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 |
factor |
an optional logical value. If |
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)
José Pinheiro and Douglas Bates bates@stat.wisc.edu
References
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer, esp. p. 162.
See Also
as.matrix.reStruct
,
reStruct
,
pdMat
,
pdMatrix
,
pdMatrix.pdMat
Examples
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdMatrix(rs1)