pdfactor-class {lme4} | R Documentation

## Factors of positive-definite matrices

### Description

If S is a positive-definite matrix then any square matrix L such that S = L'L is said to be a square-root factor of S. The `pdfactor` class is the class of such matrices.

### Objects from the Class

Objects can be created by calls of the form `new("pdfactor", ...)`. More frequently they are created by coercing a `pdMat` or `pdmatrix` object to the `pdfactor` class.

### Slots

`.Data`:
  `"matrix"`: the factor itself, a numeric, square matrix
`logDet`:
  `"numeric"`: the logarithm of the absolute value of the determinant of the factor.

### Extends

Class `"matrix"`, from data part. Class `"structure"`, by class "matrix". Class `"array"`, by class "matrix". Class `"vector"`, by class "matrix".

### Methods

coerce
  `signature(from = "pdIdent", to = "pdfactor")`: extract the pdfactor from a `pdIdent` object.

### See Also

`pdMat-class`, `pdmatrix-class`

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