This method function extracts the positive-definite matrices
corresponding to the
pdMat elements of
an object inheriting from class
further arguments passed from other methods.
a list with components given by the positive-definite matrices
corresponding to the elements of
Jos<c3><a9> Pinheiro and Douglas Bates [email protected]
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York.
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