Matrix.pdMat              package:nlme              R Documentation

Assign Matrix to a pdMat Object

Description:

     The positive-definite matrix represented by 'object' is replaced
     by 'value'. If the original matrix had row and/or column names,
     the corresponding names for 'value' can either be 'NULL', or a
     permutation of the original names.

Usage:

     ## S3 method for class 'pdMat':
     matrix(object) <- value

Arguments:

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

   value: a matrix with the new values to be assigned to the
          positive-definite matrix represented by 'object'. Must have
          the same dimensions as 'as.matrix(object)'.

Value:

     a 'pdMat' object similar to 'object', but with its coefficients
     modified to  produce the matrix in 'value'.

Author(s):

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

See Also:

     'pdMat'

Examples:

     pd1 <- pdSymm(diag(3))
     matrix(pd1) <- diag(1:3)
     pd1

