logDet.pdMat {nlme}R Documentation

Extract Log-Determinant from a pdMat Object

Description

This method function extracts the logarithm of the determinant of a square-root factor of the positive-definite matrix represented by object.

Usage

## S3 method for class 'pdMat':
logDet(object, ...)

Arguments

object an object inheriting from class pdMat, representing a positive definite matrix.
... some methods for this generic require additional arguments. None are used in this method.

Value

the log-determinant of a square-root factor of the positive-definite matrix represented by object.

Author(s)

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

See Also

pdMat

Examples

pd1 <- pdSymm(diag(1:3))
logDet(pd1)
[Package nlme version 3.1-66 Index]