| coef.pdMat {nlme} | R Documentation |
This method function extracts the coefficients associated with the
positive-definite matrix represented by object.
## S3 method for class 'pdMat': coef(object, unconstrained, ...) ## S3 method for class 'pdMat': coef(object, ...) <- value
object |
an object inheriting from class pdMat,
representing a positive-definite matrix. |
unconstrained |
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. |
value |
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.
Jose Pinheiro and Douglas Bates
Pinheiro, J.C. and Bates., D.M. (1996) "Unconstrained Parametrizations for Variance-Covariance Matrices", Statistics and Computing, 6, 289-296.
coef(pdSymm(diag(3)))