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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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