This method function extracts the coefficients associated with the
positive-definite matrix represented by object
.
# S3 method for pdMat
coef(object, unconstrained, …)
# S3 method for pdMat
coef(object, …) <- value
an object inheriting from class "pdMat"
,
representing a positive-definite matrix.
a logical value. If TRUE
the coefficients
are returned in unconstrained form (the same used in the optimization
algorithm). If FALSE
the upper triangular elements of the
positive-definite matrix represented by object
are
returned. Defaults to TRUE
.
a vector with the replacement values for the coefficients
associated with object
. It must be a vector with the same length
of coef{object}
and must be given in unconstrained form.
some methods for this generic require additional arguments. None are used in this method.
a vector with the coefficients corresponding to object
.
On the left side of an assignment, sets the values of the coefficients
of object
to value
.
Pinheiro, J.C. and Bates., D.M. (1996) "Unconstrained Parametrizations for Variance-Covariance Matrices", Statistics and Computing, 6, 289-296.
# NOT RUN {
coef(pdSymm(diag(3)))
# }
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