as.matrix.pdMat             package:nlme             R Documentation

Matrix of a pdMat Object

Description:

     This method function extracts the positive-definite matrix
     represented by 'x'.

Usage:

     ## S3 method for class 'pdMat':
     as.matrix(x, ...)

Arguments:

       x: an object inheriting from class 'pdMat', representing a
          positive-definite matrix.

     ...: further arguments passed from other methods.

Value:

     a matrix corresponding to the positive-definite matrix represented
     by 'x'.

Author(s):

     Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

References:

     Pinheiro, J. C. and Bates, D. M. (2000), _Mixed-Effects Models in
     S and S-PLUS_, Springer, New York.

See Also:

     'pdMat', 'corMatrix'

Examples:

     as.matrix(pdSymm(diag(4)))

