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 3.1-57

Index]