as.matrix.reStruct           package:nlme           R Documentation

Matrices of an reStruct Object

Description:

     This method function extracts the positive-definite matrices
     corresponding to the 'pdMat' elements of 'object'.

Usage:

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

Arguments:

       x: an object inheriting from class 'reStruct', representing a
          random effects structure and consisting of a list of 'pdMat'
          objects.

     ...: further arguments passed from other methods.

Value:

     a list with components given by the positive-definite matrices
     corresponding to the elements of 'object'.

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:

     'as.matrix.pdMat', 'reStruct', 'pdMat'

Examples:

     rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
     as.matrix(rs1)

