solve.pdMat {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)

[Package

*nlme* version 3.1-57

Index]