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)))