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This method function extracts the positive-definite matrices
corresponding to the pdMat
elements of object
, or
square-root factors of the positive-definite matrices.
# S3 method for reStruct
pdMatrix(object, factor)
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.
an object inheriting from class "reStruct"
,
representing a random effects structure and consisting of a list of
pdMat
objects.
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
.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer, esp. p. 162.
as.matrix.reStruct
,
reStruct
,
pdMat
,
pdMatrix
,
pdMatrix.pdMat
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdMatrix(rs1)
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