solve.pdMat               package:nlme               R Documentation

Calculate Inverse of a Positive-Definite Matrix

Description:

     The positive-definite matrix represented by 'a' is inverted and
     assigned to 'a'.

Usage:

     ## S3 method for class 'pdMat':
     solve(a, b, ...)

Arguments:

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

       b: this argument is only included for consistency with the
          generic function and is not used in this method function.

     ...: some methods for this generic require additional arguments. 
          None are used in this method.

Value:

     a 'pdMat' object similar to 'a', but with coefficients
     corresponding to the inverse of the positive-definite matrix
     represented by 'a'.

Author(s):

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

See Also:

     'pdMat'

Examples:

     pd1 <- pdCompSymm(3 * diag(3) + 1)
     solve(pd1)

