R: pdMat Object Coefficients

coef.pdMat {nlme}

R Documentation

pdMat Object Coefficients

This method function extracts the coefficients associated with the positive-definite matrix represented by object.

## S3 method for class 'pdMat'
coef(object, unconstrained, ...)
## S3 replacement 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.

José 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)))

[Package nlme version 3.1-131 Index]