pdFactor {lme4} | R Documentation

## Square-root factor

### Description

This generic function extracts the square-root factor of the positive-definite matrix represented by `object`. Letting S denote a positive-definite matrix, a square-root factor of S is any square matrix L such that S = L'L. This function extracts L.

This function is deprecated. Use coersion to the `pdfactor` class instead.

### Usage

    pdFactor(object)

### Arguments

`object` | an object inheriting from class `pdMat`, representing a positive definite matrix, which must have been initialized (i.e. `length(coef(object)) > 0`).

### Value

A `pdfactor` object.

### See Also

`pdMat-class`, `pdfactor-class`

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